I'm wondering how they'll get over the OpenGL hump.
Well part of any OpenGL hump is Microsoft propaganda, like how they tried to use propaganda about DirectX 10 to get everyone to switch to Vista. Or who knows, maybe Apple is bribing them to care about Mac all of a sudden.
won't you need decent specs to play on it? IE: the later Intel based compys?
I suppose a powermac g5 could run this stuff pretty well. But I can't think of anything below that threshold that'll have enough power to run modern games.
This is kind of an odd point, since it's not like PC gamers expect to run modern games on 5 year old computers. Most hardcore PC gamers have a ridiculous obsession with cutting edge hardware that leads them to consider videocards obsolete after 1 year.
Anyway I would doubt Valve is planning to port Source to G5 chips. I can't think of many software developers going to the trouble of building universal binaries these days because, well, there's not much value in supporting 5 year old computers unless you're writing software for schools to use.