RetroArch 1.0.0.3 has been released.
Release notes are here. They include links to an Ubuntu PPA from which you can download it:
http://buildbot.libretro.com/beta/1....ease_notes.txt
New features include a PSP core and a new "XMB" menu interface.
RetroArch 1.0.0.3 is a Linux release. The next version for Android, 10.0.4, will be released later.