We're all getting ready for Deathwing and his sundering of the world by raiding the last few bosses of ICC, jumping into the Ruby Sanctum and beating it until it turns into a broken loot box, and leveling our alts. I, for one, have been focusing on the latter. My 80s are geared appropriately for the level 80-85 zones that are coming in Cataclysm, and I believe I'm pretty well prepared. I have enough gear to get into ICC hard mode runs to pass the time if I get really bored, but other than that, I'm focusing on leveling my baby shaman and paladin in preparation for Cataclysm and the old world changes.
If you're not doing any of that, then you're probably hitting one of the game's many meta-games. Gold farming, achievement grinding, rep grinding, mount grinding ... pretty much any kind of grinding there is to be done is a popular option in the calm before the Cataclysm. A huge gold pool to work with when you reach 85 is going to give any type of player an upper hand -- casuals, hardcore raiders, hardcore PvPers alike. Completing WoW's current iteration of achievements before they become Feats of Strength can increase the ever-important ego of every player, and grinding (especially old-world reps) can give you things that may become impossible to retrieve when Deathwing goes insane all over the Azeroth we all know and love.