The Windows Ultimate Extras Team today posted a short notice on the Windows Vista Ultimate site updating the community on the status of Ultimate Extras; go here to read their post. To sum it up for you here, the team recognizes that they've been dark for some time on the topic of Ultimate Extras, but want to go on record that they plan to deliver pending DreamScene and Language Pack Extras by summer's end, and expect to disclose a schedule of further Extras releases after that milestone. The reason for the Extras' delay has been the team's staunch devotion to final quality; your feedback, on DreamScene in particular, has been key to ensuring their focus on meeting the community's exacting standards. They plan to add to the Extras line up from then on out to make Ultimate the only version of Windows Vista you'll want to use.
And before you ask: no, I don't have any additional details, as the team has priorities that supersede my questions (in other words, they're hard at work). But, know that I'll pass along any feedback you may have for them, be it regarding the current slate of Extras or what you'd like to see the program deliver in the future.