FS-UAE Improvements
Here are just some of the improvements in FS-UAE:

• Many improvements, several bug fixes, and new translations.
  
• FS-UAE now supports multiple mice at the same time. Especially useful for games such as multiplayer Lemmings.
  
• Improved packaging for several Linux distributions.
  
• Support for SDL 2.0 (currently used by the OS X version).
  
• “Portable” distributions are available for Windows and OS X.
  
• Several more FS-UAE configuration options are available.
  
• JIT should work on Windows (x86) too now.
  

FS-UAE Launcher Improvements
FS-UAE Launcher has seen many improvements since 2.2.3, among other:

• Improved preferences dialog, many more options added.
  
• Much better support for the online Amiga game database.
  
• Support for automatically and manually downloadable games.
  
• Online Amiga game database no longer marked as experimental.
  
• QT toolkit is now used for FS-UAE Launcher on all platforms.
  
• Improved joystick/gamepad configuration tool.
  

Log File Location
Log files are now by default stored in Documents/FS-UAE/Cache/Logs. FS-UAE will try to delete the old log files (and log dir) to avoid confusion.
Swapped Display Order of Joystick Ports
The display order of mouse and joystick ports has been swapped, with the joystick port on top. This fits better with the convention that the joystick port is usually used by player 1, and especially the joystick tab with all four joystick ports is easier to use the port order equals player order. The ports are now called “Joystick Port” and “Mouse Port” instead of Joystick Port 0/1.
Video Synchronization Disabled by Default
Video sync is now off by default, to avoid performance issues on some platforms. There’s a new preferences page in FS-UAE to enable video sync.
Upgrading from FS-UAE Launcher 2.2.x
When updating from 2.2.x, the game database and file database in FS-UAE Launcher will be cleared, so you need to rescan your files. You’ll also need to log in to the online database (if you’re using it) and refresh the game list.
Alpha Preview Release of FS-UAE Arcade
A preview release of FS-UAE Arcade – a fullscreen interface for browsing and running games is now available as “alpha”. You need to log into the online game database in FS-UAE Launcher in order to use it. Remember, this is a preview release, and there are still some rough edges in FS-UAE Arcade, so your mileage my vary.