Nothing really "new" to see here. Apple is just bringing more iOS features to OS X, blah blah. I personally think they are heavily working on the next generation of Mac OS and keeping everything under heavy lock and key as these "new features" are weak. Maybe they are waiting for Windows 8 to release. Who knows.
With that being said, IMO, we should see some mind blowing stuff come out from Apple in the next 2-3 years. A new iPhone, new OS, the Pro line of MacBooks going to a more "Air" body style, etc.
One thing I notice on "Game Center" is it appears that we will be able to run iOS games on our Macs. Hope that's true, that would be awesome.
If you have an iOS device and use Message, you should download Messages Beta for OS X. Works great and blends with iChat very seamlessly.
I don't expect 10.8 to cost over the usual $30 but it will be a while (if ever) before I upgrade. Lion is pretty awesome and it works just fine for me.