ok i am just wondering what the system requirments are for this game.... cause i am wondering if i should buy a brand new graphics card for this game cause i bought my computer in 2005..emachine and have not put a graphics card in it yet and i really want to play this game?! help me out

I don't think the requirements have been released yet. You should wait until they are to buy a new graphics card .

the requirements are unknown at this time

Unfortunately, yes.. the requirements haven't been released yet, despite the game being set (unofficially) for March(Q1-Q2) of '08. Which is odd as we usually have some form of estimates from the development team by now.
However, an obvious guess would be to say that it'll be compatible on your average machine yet competitive with current computer technology.
If i had to guess;

Processor: 2.4+Ghz
Video Card: 256mb +
RAM: 1-2gb
Windows XP/Vista and Macintosh versions
Memory - 4gb

Now those are only guesses taking from experiences of past games and what this one incorporates... so don't take my word on it.. but the above would be running on relatively low settings, especially.