Just came from GameStop at my local mall with a receipt for prepayment of Shivering Isles. Yep, they've got a release date. TENTATIVELY, Shivering Isles will be released on March 26, 2007. As with all things gamey, the date is subject to change.

Cost was around $33 before taxes. They also had a recent mag with pics in it from the expansion. Don't remember the name of the mag though. Sorry. Brain is 1/2 fried from work.
Chiglet

To the Void we all shall go...