There are a lot of unanswered technical questions concerning Jetpack.
There's already more than 250 problems posted at wordpress.org. How much time will it take to implement Jetpack?
Can I pick and choose the individual features.
Will this become part of the core.
Will I have to view the Jetpack messages in Dashboard if I choose not to use it?
I'm going to wate on the upgrade and see how this pans out.