Most of these wont make it this year .

Yep, it's a lot like 3-2-1 Contact.

What did Sony show last year at the GDC?

PhyreEngine and G.I.R.L.

It's not easy finding year old information. Sony seems to haven't shown much in 08
Microsoft last year showed at least Fable II and Ninja Gaiden II en announced Gears of War 2

In 07 Sony showed LittleBigPlanet and Home for the first time, and showed warhawk, and behind closed doors showed a Killzone 2 demo. 

Don't expect much from GDC, that is not E3. It is GAMES DEVELOPERs CONFERENCE.
That said Insomniac confirmed they will have some people on GDC, and since they like to announce their game very early, i expect first look at new Ratchet game.
MAG, Uncharted 2, GOW3(also confirmed by team that they will show something durring GDC) , Infmaous, Heavy Rain are 100% to be there, those are not unknown project, we know about those games. I just wonder is there some new game to be shown? Since GDC is not the place where big reveal occure(even if it does happen here and there) i am not getting over hyped that's for sure.

@ CGI-Quality

It might be wishfull thinking.

And leave SCEE out of it. Just blame the French.

I expect... Heavy Rain
MAG
Mass Effect 2 to be revealed as multi plat
R&C
some info on Bioshock 2
Team ICO project
and also a shed load of PSP games including Gran Turismo Portable

this would be a megaton of epicness for me. but i dont think they will.

I sure hope those Frenchies are reading this. For the sake of the world :p