Anywho, do we happen to have anyone in Beta that is decent at theorycrafting and whatnot that can give us an idea on how the builds are looking and what would be good "cookie cutter" specs? I'm planning on getting my rogue set to be levelled first during the expac so gemming my gear correctly and whatnot would probably be the best to get to cap quickly.
To be fair, there isn't a lot of theorycrafting that's worth doing yet as stuff is constantly changing. The way it currently works though, Assassination is the most effective leveling build, at least when starting from 10 - simply because it has Deadly Momentum.
For 80-85, you'll probably want an Assassination build as well, as Combat nets you too much damage, as stupid as it sounds. Like I said earlier, mobs level 83 and up hit for obscene amounts, and you cope with that as Assassination by throwing the ocassional stun and bursting the mob down. If you were playing Combat, you'd be taking too much extra hits. The style is too warrior-like for it to currently work in 1v1s with mobs.
'Cookie cutters' are at the moment straightforward, because pretty much every talent is actually 'good', which means that for 'optimal damage' you simply grab all the talents that say they increase damage. Only theorycrafting I'm interested in here is subtlety daggers vs subtlety swords/maces, but that precisely is still a moot point as subtlety simply just doesn't work yet.
Next patch we'll be getting addons, which should mean recount - I can provide some numbers then.