Please let me put all of these rumors to rest.
From the horse's mouth:
Decisions will be released online, that's through your SIS account on Friday(5/1) afternoon by 5pm. That is all I can give you about timing. We simply won't be ready until then.
We don't send email. Letters will be mailed after the decisions come out.
Unlike last year, if you are a rollover, you will be able to see your decision online.
I'm not sure if this feels better, but at least it gives you more of an idea about timing. Eat, sleep and study for those exams readers!
Note: If you have a question about transferring in the future(not Fall 2009), you might want to hold off for a week or two. Your comment will likely get swallowed in decision commentary and I simply can't reply to everyone.