Excuse my possible (and likely) ignorance. I'm coming back from an inactive streak :|
Gen 6 OU isn't up yet. But they are working on it, and have made a few changes so far, such as Heatran going Uber (I think :3) and Excadrill coming back to OU.
They have already established an XY uber banlist and after usage statistics everything will have been sorted. On the official simulator for Smogon, PS, it is possible to play OU in both the current and Pokebank formats.
http://www.smogon.com/forums/threads/official-xy-ou-banlist.3491371/ -- Banlist