Below you will find an extensive list of the work that went into MorphOS 3.11.
Please note that this is just an overview and does not mention or explain every new feature.
 
MorphOS 3.11 boot.img Changes

The following is a (probably incomplete) list of changes made between the 3.10 and 3.11 release of MorphOS to the ROM (boot.img) based components.

Emulation

  • Fixed CAS/CAS2 instruction emulation

Hyperbootloader

  • Convert 'ISO9660' into 'CD0' when creating the command line for booting MorphOS. Fixes a delay when booting from CD

P50x0_eth New

  • A resource used for handling access to resources related to P50x0 Ethernet.

Quark

  • Map the second Frame Manager on P5040 machines

Powerbook

  • Fixed PowerBook5,6 and 5,7 fan control
  • Fixed a memory leak on older PowerBooks and iBooks that would leak a little memory every second, also caused a performance hit over time
  • Fixed a rare memory leak in battery handler
MorphOS 3.11 Disk Changes

Following is a (probably incomplete) list of changes made to the disk based components of MorphOS.

Ambient

  • Fixes in keyboard handling in listers
  • Fixed double-clicking on Lha archives
  • The LOADURI ARexx command now uses default view and default view mode if one or both of them are omitted
  • Added a "Open Parent" to the context menu of a panel button to open a lister
  • Inline edit, pressing space delete a sign/entry or jumps to the next entry
  • 'Create Archive' fixed to add multiple files to a single Lha archive

Applications/Flow Studio

  • Postscript files are now displayed with their style settings
  • Statusbar now displays multibyte char codes correctly
  • Non-breaking space, i.e. 0xA0 or C2A0 (in UTF8) is now displayed in the style of a control character
  • 'Replace all' operation now respects the regexp setting for the search part
  • Improvements to printing using screen colours
  • Made it possible to add / remove breakpoints when the debugged task is already running and is not suspended
  • Makefile generator can now handle files in subdirectories
  • Suppressed some output from the generated makefiles
  • -noixemul switch was used even for ixemul projects
  • Performance improvements
  • Replaced various icons with additional custom-made versions

Applications/Odyssey

  • Introduces support for dozens of additional and nowadays commonly used CSS property names
  • Adds support for additional CSS property values used by modern flexbox and grid page layouts
  • Adds support for native CSS Filters for use with and without vendor prefix, which did require the temporary disablement of rarely used SVG filters
  • Adds native support for CSS Regions
  • Disables native JavaScript Promises support as newer websites fail to consider partial implementations, which increasingly caused incompatibilites
  • Optimized the internal handling of Webkit events, which fixes a performance hit with many tabs open
  • Odyssey now tries to prevent embedded media files from autoplaying without any prior user action in order to minimize severe performance degradation and other disruptions (unexpected noise disturbences, etc)
  • Added new "Autoplayer" user-script to control the forementioned behavior via a user-maintained whitelist of websites
  • Updated the included ad-blocker list to a more recent state and added workarounds to prevent issues with otherwise benign content delivery networks
  • Cleaned up the information on the 'about' page to be more succinct and relevant

Applications/Jukebox

  • Fixed a bug where the Gauge object was displayed on the window frame

Applications/RemoteShell

  • Updated OpenSSL to 1.0.2o

Applications/Showcase

  • Store JPEG with selected ICC profile
  • Fixed colorspace for files without ICC

Applications/Vpdf

  • Use mediasize provided in the pdf for passthrough print mode
  • Allows to specify a direct file if postscript output is enabled and no printer profile is selected or available
  • Refreshes printer profile list and related cycle gadget after new printers preferences has been called
  • Show the profile selected output path if a printer profile is selected in postscript mode

C/CloneX

  • Fixed misspelled APPENT option to also accept correctly spelled APPEND

C/Ed

  • Tweaked wordwrapping defaults

C/Playmidi

  • Added /A to clustername argument

C/Textconv

  • Use stderr for errors, if available

C/Waitx

  • Implemented UTC/S

Classes/Frameworks/mui.framework

  • Use MUIM_List_SortEntries for a flickerless sort
  • Fixed not to rely on MUIM_Notify result since it is always FALSE for Group and descendants

Classes/Frameworks/ob.framework

  • Fixed a memory leak in OBMutableString
  • Fixed a race condition in OBTimer

Classes/Mui/Scintilla.mcc

  • Improved ESC key handling when Scintilla is in focus
  • Performance optimizations

Classes/Mui/Wpasupplicant.mcc

  • Fixed a bug that made it hard/impossible to select a new network from the list

Classes/USB/Audio

  • Fixed to handle per-channel global volume controls
  • Fixed several race conditions & crashes when unplugging USB audio devices

Classes/USB/Printer

  • USBPAR is now included in DOSDrivers

Devs/Monitors/Radeon

  • Added R600/R700/Evergreen/Northern Islands interrupt support
  • Fixed AGP support on R500 and R600 cards
  • Fixed HDMI output on some Northern Islands cards
  • Fixed overlay stability issues
  • Disabled DMA writebacks in PCI DMA mode

Libs/Cryptostorage New

  • Encrypted key-value storage library.

Libs/Ixemul

  • Fixed: large fread could result in premature EOF. Caused spurious EOFs when doing large reads with pipes

Libs/Mpega

  • Fixes to CVE-2017-8372, CVE-2017-8373 and CVE-2017-8374

Libs/Pciids

  • Updated pci.ids file to version 2018.06.18

Libs/Thumbnail

  • Updated ffmpeg to 3.4.2

Libs/Tinygl/Drivers/R200

  • Disabled debug output

MUI

  • Added MUIM_List_SortEntries

Prefs/Printers

  • Improved error handling of PPD printer config imports
  • Fixed cupsFilters handling

Skins

  • Changed the default MUI settings so that window sizes / positions are stored permanently by default

Tools/IWizard

  • Fixed to correctly identify targets for OS updates
  • Added new splash graphics

Utilities/Keyexplorer

  • Improved dead key handling