Here’s a new iso based on Ubuntu 12.04 and the latest version of XBMC (Frodo). This version contains the PVR functionality and all improvements that has been made to the core due to the Raspberry Pi Support. Other new items worth mentioning are covered here: http://xbmc.org/natethomas/2012/09/06/xbmc-august-2012-cycle/
A remark on this release is that many changes were added lately and that things might be broken.
Direct download is here: http://xbmcfreak.binkey.nl/xbmcbuntu-11.9-wsnipex-testing-v6.iso