Here's whatsnew:
"File|Save screenshot..." command (WinArcadia).
Redefinable console keys and 3rd/4th firebuttons (WinArcadia only).
Improved CD32 gamepad support (AmiArcadia only).
Autosense: support for 3rd and 4th firebuttons.
Emerson Arcadia 2001: compatibility improvements.
Miscellaneous improvements and bug fixes.

Get it here:
http://amigan.1emu.net/releases/#amiarcadia

-Trebor