While this is a welcome announcement*, I'd be MUCH more excited if Stardock had shown any ability to update and support any of the .dreams people have PAID for over the past year(s). Meaning that there has been almost NIL support of the actual .dreams since the main program's release. No SDK, no updates, few commercial releases...
...and even those have been inexplicably poorly supported. And yes I am talking first and foremost about PHOTO COLLAGE. A release so rushed to market it didn't even come with a random photo sort function or the ability to read image subdirectories recursively. This is made even more inexplicable by the fact that another Stardock released commercial .dream, PHOTODREAM, has BOTH of these bits of code already in it...ahem.
As such, it appears to me that we're all about to get yet another version of this completely unsupported application for yet another operating system, thereby exciting, then frustrating, and finally disappointing a whole new batch of end users. 
Sorry to be such a pisser about this, but the potential of creating .dreams to take the ideas of DesktopX to the next level, interface wise, have not escaped me. Perhaps Stardock felt they needed to have Dreamscapes working across XP and Vista before going to the next step, integrating it throughout their product line. I completely understand that line of thinking.
But with the SDK still not anywhere in sight, it just looks like we're all stuck with the gimmick instead of the potential a while longer. 
Maybe that's the plan for Dreamscapes 3.0. We can only hope.
* I love Deskscapes on Vista, but VLC has had the ability to play videos as people's XP desktop backgrounds for years.