I say go for it. I ordered mine a week before the new ones out and I have no regrets so far. I'm coming from a 2010 macbook pro and this thing flies in comparison, plus the size makes it the perfect machine for me. As far as gaming goes I've been pleasantly surprised. I've been playing MW2 and Bioshock and both run almost perfectly. Bioshock is runs smooth as silk on maxed out settings. Pull the trigger!
I knew the only upgrade was going to be the Ivy Bridge and for the things I use the machine for I wouldn't see any tangible difference. I don't care about USB 3.0 since I have Thunderbolt and the HD 3000 is more than enough for the games I play. So I saved a few hundred and bought a refurbished one from Apple. Loving every minute so far.