Landscape pictures and music tabs don't work right with 6.5.1 right now though (bottom bar doesn't disappear) . Something to do with the position fix for manila.
As for 6.5.1 task manager, You can use Enatives showcase Suite by amarullz.. Although there are still some kinks to work out. (freezes sometimes when a process hangs and it tries to read it)
http://forum.xda-developers.com/show...03&postcount=3