Windows Vista Ultimate.. Now!

Guess what landed on my desk this morning? Yup the ultimate. I'm doubting that this is the final version simply because its not released yet. And as far as i know, all windows vista versions come in one desk and it depends on the key and what version that key unlocks. However, I need to reinstall widows on my home PC anyway and I wanna fiddle with vista a little. So if it turns out to be a beta i have noting to loose.