Drox posted that some UI mods have already been updated for use with the latest game update #2 patch. You will definately want to check them out and update your UI if you use any custom UI mods. You can find his post here.
With the release of Game Update #2, most UI mods will need to be updated to support the new features such as rest experience and quest tracking options. The first updated UI mods have been posted on VGInterface already and more will undoubtedly be posted in the coming days.
http://forums.station.sony.com/vg/posts ... c_id=16332