It's all but confirmed:
The Orange-Box 2 (I think they may call it the Green box though):
HL2: EP3
L4D2
CS:S2
Portal 2
Probably throw in TF2, the backlog of the HL series, and maybe another Lost Coast-type campaign.
Um... Where have they announced CS:S2, because I haven't seen anything online, or from E3 about it?
It's all but confirmed:
The Orange-Box 2 (I think they may call it the Green box though):
HL2: EP3
L4D2
CS:S2
Portal 2
Probably throw in TF2, the backlog of the HL series, and maybe another Lost Coast-type campaign.
)Blue Box? Maybe Black Box? (Nvm, Black Box was a project from Valve and it's dead, in a soup-can)
Portal 2? with co-op? (Nice!)
HL2 : EP3 (I need to get HL2 : EP1 and EP2!)
CS:S2 (WOOT! WOOT!)
L4D2 (Boycott!)

Rainbow box
I just want ep3 to come out....
This is all sepculation guys, dont get over excited.