Anyone has received their credit for the Developer Transition Kit return?

Yes. Well, not me personally (-: but I’ve seen reports from lots of folks who have.

If you got a DTK then you should have access to the Universal App Quick Start tag, and there are lots of threads so tagged discussing this.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"