It is clear that Apple isn't ready to talk too much about the next version of OS X, Snow Leopard, but they are eager to set expectations. In addition to the press release we pointed to earlier today Apple has created a new section on its website explaining the focus of Snow Leopard.
Snow Leopard is all about making sure that users have a consistent experience across Apple products. Apple will be adding full Exchange support in Mail, Address Book, and iCal because it is in the iPhone. Apple is working on shrinking the amount of hard drive space OS X requires, no doubt because they figured out how to make OS X much smaller to run on the Apple TV and the iPhone. We'll also be seeing a new version of QuickTime, QuickTime X which will support 'all modern codecs.'
There isn't a ton of information on the site, but there is enough to leave you wanting more.