Does anyone know if there will be any accessible games, besides chess, that will be packaged with Leopard?
Besides Chess, the Mac does not come with any games standard, although various games have been bundled with iMacs at various time. Chess is there only because it is an illustrative demonstration of an OS X implementation of a common Unix application.
There are some good games on the Apple website,
None of those are developed by Apple. Most are commercial products.
but it doesn't say whether or not they can be played using VoiceOver.
The same could be said about all the software linked to from the Apple site. If the commercial productivity applications do not mention VO compatibility, why would the games?
