oh ok then you can expect medium at that res the gpu holds you back
but it all comes to one question and that is if the game is optimized good so while i think you will be able to run it, it depends if it is optimized
lets hope it won't be like gta4, otherwise we are doomed.
i think, it would be low-med (only some medium) if you want a decent fps, but that is just what i think.
best thing is to wait for the game, check reviews, then you'll see if you need to upgrade or not