Ok so I thought I'd comment on each game you posted. The end result is pretty conclusive... most games coming soon will be crap! Certainly far from dead, but theres just a huge shortage of great games I feel. Also a lot of your dates are wrong!
This is only the list that interests me, there are a lot more games that may suit other interests. Doesnt really seem pc gaming is dying
FlatOut: Ultimate Carnage
Due for release on 01/08/2008
Looks poor and is also out on consoles, so will probably be a port.
Jade Empire: Special Edition
Due for release on 08/08/2008
A pretty poor game which is already available anyway. Another port.
S.T.A.L.K.E.R.: Clear Sky (Stalker)
Due for release on 29/08/2008
Looks like it could redeem the STALKER series, though the first was severely disappointing.
Warhammer Online: Age Of Reckoning
Due for release on 01/09/2008
Just another MMO. Doesn't look that great so far.
Aion: The Tower Of Eternity
Due for release on 01/09/2008
Another crappy fantasy MMO.
Spore (PC & Mac)
Due for release on 05/09/2008
Perhaps one of the most innovative games here, but could still turn out crap!
Mercenaries 2: World In Flames
Due for release on 05/09/2008
Looks very poor from what I've seen so far. Probably another port.
A Vampyre Story
Due for release on 19/09/2008
Could be good for what it is, but it's hardly an AAA title.
Multiwinia: Survival Of The Flattest
Due for release on 19/09/2008
Looks like the training from PlanetSide or something. Meh.
StarCraft II
Due for release on 26/09/2008
Could be one of the best games ever. Or one of the worst disappointments.
Ghostbusters: The Video Game
Due for release on 26/09/2008
Another port, will be better on consoles due to controls.
X3 Terran Conflict
Due for release on 26/09/2008
X3 was a good game, but you might as well play EvE.
Crysis: Warhead
Due for release on 29/09/2008
Could be awesome but could also be another failboat of poor performance.
Fallout 3
Due for release on 03/10/2008
Looks stunning. Not sure if it's a port or not though.
Pro Evolution Soccer 2009
Due for release on 17/10/2008
I don't do football games, but surly it's more of the same?
Far Cry 2
31/10/2008
Looking to be one of the best game of the year so far.
Dead Space
31/10/2008
Another port I think. Looks interesting but not exiting, could surprise.
Lego Batman: The Video Game
Due for release on 31/10/2008
Lego games are ok on consoles, but meh, not the kind of thing I want on my PC!
Tiberium
Due for release on 31/10/2008
Bring it on!
The Lord Of The Rings Online Compendium: Volume II - Mines Of Moria (Full Game + Expansion Pack)
Due for release on 14/11/2008
Just as crap as the main game.
Warhammer 40,000: Dawn Of War II
Due for release on 28/11/2008
Could prove to be one of the best RTS games ever.
Singularity
Due for release on 28/11/2008
Don't really know much about this yet. Could be a port though.
Jumpgate: Evolution
Due for release on 28/11/2008
Another MMO. Looks crap. Not due until 2009 anyway.
Dragon Age: Origins
Due for release on 30/01/2009
Could be pretty awesome.
Empire: Total War
Due for release on 06/02/2009
Looks pretty poor, could be ok though.
Diablo III (3)
Due for release on 27/03/2009
Diablo is not for me, but it should be great for those that do.
Command & Conquer: Red Alert 3
Due for release on 27/03/2009
Looks poor... noooooo can't believe I just said that!
Wolfenstein
Due for release on 27/03/2009
Not much known really.
Aliens: Colonial Marines
Due for release on 27/03/2009
Will be awesome just because you get to shoot Aliens!
street fighter IV
Due for release on 27/03/2009
Meh.
Alan Wake
Due for release on 01/05/2009
Maybe!