I've been looking at cataclysm raid details and it seems there will be the same ammount of bosses but spread over other raids for each tier

Launch:
Blackrock Descent (5 bosses)
Throne of Four Winds (2 bosses)
Bastion of Twilight (4 bosses and 1 hc only boss)
Baradin Hold (1 boss similar to voa)

So thats a total of 12 bosses for all raids at launch compared with wotlk's 22.

I prefer this style of ammount of bosses.

Im also going to think of raids for future patches too

4.1:
Firelands
WOTA (COT)
New Baradin Hold Boss

4.2:

Vashj'ir raid
Baradin Hold Boss

4.3:

Deathwing raid
Baradin Hold Boss

This is my prediction on what future raids will be in cataclysm.