Windows
Core:
microVU fixes for Dreamworks games, later Tony Hawks games, Evil Dead and others
Fixes to New GIF unit to solve regressions
microVU bugs fixed (affecting Extreme-G Racing and others)
CDVD fixes (Impossible Mission now boots)
Path 3 arbitration and timing refinements
MFIFO fixes for DDR games
Huge DMAC bug fix solving most of the problematic videos. (Baldurs Gate 2, Katamari Damacy and more)
Memory card support improved in many games, now supports PSX memory cards also Multitap support improved greatly
Many game fixes for COP2 problems inherent with emulation. (Ace Combat, Forbidden Siren and others)
VIF Unpack optimizations
VU Delays added to fix the graphics of Snowblind engine games (Champions of Norrath, Baldurs Gate 2)
Various other game specific fixes in GameDB
NVM file creation (if one doesn't exist) now fills in iLink ident. (Age of Empires 2)
SPU2-X:
Improved DMA system
Fixes to reverb
Improved time-stretcher recovery on extreme speed changes.
Portaudio (providing WASAPI in Windows, ALSA/+OSS in Linux) now supported and the default output module. Latencies with this mode are lower than other modules
GSdx:
Improved adapter selection for detecting of videocards
CLUT (Color LookUp Table) fixes for games such as Disney Golf
Texture Offset options added to help improve upscaling artifacts
OpenGL mode added (Experimental currently)
Various CRC hacks
Hack for NVIDIA cards, solves problems with stretching on drivers above 320.18
New shader resources! Complete PCSX2 FX Revised 2.0 by Asmodean has been integrated
DEV9ghzdrk:
Improved support for online play and make the users MAC address unique.
Linux
Core:
Support for external patch (pnach) files
OnePad changes:
Bugfixes for multiple button presses
Bugfixed memory leaks
ZZogl:
Added support for MESA drivers
Bump OpenGL requirement to 3.0 with floating texture
Various OpenGL fixes
SPU2-X:
Added SDL Backend
The PCSX2 executable has been built and tested with PGO optimizations enabled so it will be an extra 10% faster over regular SVN builds.