I was supposed to go into detail with keybindings using an addon this week, but we'll put that on hold for now. We can always revisit keybindings another time, but so much has happened on the beta that it would just be wrong not to take a look at what's going on. By now, many of the abilities are pretty set, and with a rumored November release on the horizon -- an idea that's got some meat behind it now that the background downloader is working on a hefty 4 GB worth of 4.0.1 goodness -- it looks like what we see is what we'll get. The numbers will probably be tweaked up or down on some spells and talents, but for the most part, I think we've got a pretty solid feel for how the game will play.
The new game mechanics will take some getting used to for some classes such as warlocks, who become a cooldown class, and paladins, who now manage a secondary resource. Players have all of the pre-Cataclysm and the grind to level 85 to get a good feel for things, and that should be plenty of time. But never mind the new abilities -- those are fun, for sure -- but there's an entire support system for World of Warcraft PvP that raises the bar in a way we've never experienced. New battlegrounds, a standardized currency on par with the PvE system, guild support ... Cataclysm PvP is going to be fun as hell.