Seeing as the Mac operating system has changed again with the advent of Mavericks will games be updated to come inline with this ?

Big question maybe but if this does not happen then there will be people with games that they have purchased that will not work anymore, which is not a good thing.

Myself I am going to be very very very careful about what I buy in future having just updated and found I now have software that I purchased that no longer works under Mac OS in a short space of time.

Also some Mac games compatibility listed here is incorrect, you have to look at the small print as they say and even then it maybe wrong.