Eventhough it's no guarantee, you could post the games you are interested in
and who knows a person with access to that game and Vista might test it for
you...
So if you have any games at all you are interested in - just ask
In addition to the above you can surely contact the game vendor directly and
see what they say. A lot of game manufacturers have already comitted to
Windows Vista (no surprised) when it is final - so don't expect support for
Vista related questions untill it has gone gold / RTM. Hence my initial
offer of asking the community
Hope this helps.
With kind regards,
Aprazeth