The discount will be available to all upgraders/early adopters for the first two weeks. I don't have the exact start/stop dates yet because Apple has not yet approved it. It slipped into their holiday off time due to a small change that was needed. Unfortunately, it is again waiting for review. So in the next few days we should finally see it go live.
PS. I am not sure what you mean by question #3.
Regarding anything else -- not in particular, but I can tell you we are making good progress on Space Server