I won't be upgrading. In fact, I'm trying to downgrade from Lion! I don't care for it too much! Any way to do that?
I'm definitely going to do the upgrade, is just 19.99$, very competitive price to have a new OS on my MacBook Pro 15" Late 2011. There are a lot of great new features and I really want to see the AirPlay Mirroring on Apple TV, that option open the doors to use the Mac in many new ways. Note for the writer of the article: when you list the new features of OS X Mountain Lion at the end of the article "Game Center" appears two times.
Seeing as my Retina Macbook Pro has yet to be shipped, I'm guessing it will come preinstalled with Mountain Lion. Definitely excited!