Netkas identified an interesting point in Mac OS X 10.6.3 beta, not yet documented by Apple:
Apple continues to deploy support for Open GL 3.0 that was so far absent in Mac OS X while already supported by our graphic cards. Maybe with some luck we could soon expect a full support for Open GL 3.0 as well as a game editor based on Open GL 3.0, that will give us an optimized engine, instead of "Ciderized" games with important compatibility issues with Snow Leopard (such as Spore)