Tera - will be an Asian grinder - looks stupid, dudes are wielding 2h swords the size of a small car - I think it will have a similar problem to Aion, not enough content to make the grind pass pleasantly. Will have a huge uptake and a huge drop off after 2-3 months.
SWTOR - will have a big uptake - since its Biowares first MMO, I foresee some headaches - I don't think its general design principles will maintain its huge box sales
GW2 - Will be a big game. Should be very successful. No monthly sub will help it weather the storm. A lot of people will pick it up as their 2nd game and puddle along. Either way it has a lot going for it. I am going to buy it as a 2nd game.
Rift - will likely have the least box sales of the bunch. But kind of like Eve has a chance to build itself a small corner and attract the disenchanted.
Cataclysm - of course it will sell. But in the end its just a stall till they release their next MMO. The WOW faithful will stay. But a lot of people are looking for something different. I think you are going to see WOW subs fall this year. Maybe by 30% 6 months after Cataclysm.