That will never happen. It's against Valve's philosophy of putting YOU into the shoes of the character as literally as possible while maintaining an interesting narrative.
EDIT: Here's an article on FPP legs in games by the way...
Call me names, but I actually played Half-Life 2 first... Therefore I didn't like Half-Life so much. I still thought it was quite impressive, I liked both the fun gameplay and the (kinda weird) plot.
One thing I can say for sure is that it's a truly extraordinary game.
Omnomnick - I don't really see how that proves there's more than one Citadel on Earth.
I thought he meant the entire network of Citadel reactors throughout different planets/galaxies/dimensions. I could be missing something though.
But I'm not even ever going to do anything important with it... I usually use Flash to make short animations, GIFs or stupid games like this. I don't need a new, expensive version.
Because I only have Macromedia Flash 8, which is quite ancient. Sorry.
EDIT: Oh, and by the way... I changed the link in the 1st post because it was the wrong one.