Two days ago, a day after the release of the game, I made a video of me playing this game. The game is surprising and I certainly did not expect anything like this! :)
You should be able to play on medium just fine, at worst low-med.
I have Core 2 Duo 2.1GHz, 4GB RAM, Radeon HD 4650M (laptop) and the game is playable on minimum settings (usually about 20-30 FPS)