I've been playing the beta in a 2009 MBP for a couple of weeks now and everything looks pretty smooth.
Question about heat: My wife's MBP (2011) runs what seems to be dangerously hot doing even basic web video and she's worried that D3 will melt it entirely.
Are the fans working alright? I get both of them running at 6k RPM when playing any game (or watching full screen Flash/Silverlight videos) but there's nothing that makes me thing it's unsafe.
Question about heat: My wife's MBP (2011) runs what seems to be dangerously hot doing even basic web video and she's worried that D3 will melt it entirely.