The release is out now, and you should have received an email/PM from SourceCoast notifying you of it.
Currently on CMS Market, when you purchase something, you have access to it for as long as their are updates. The only reason we could see modifying the product and creating a new one (requiring a new purchase) is for Joomla 1.6. However, from our initial investigations of the changes that would be required, we likely will just have one mega-version which works in 1.5 and 1.6. In short, if you've purchased it, you'll be able to download updates for a long time.
Great deal, eh?