From Richelle Mead's website (re: VA)
#6- Last Sacrifice
Coming December 7, 2010 from Penguin/Razorbill Books
Last Sacrifice will be the last book about Rose, but it'll be followed by a spin-off series still set in the Vampire Academy world. Side characters we know from the current series will now be our main characters, and there'll be a whole new storyline (not the last one told from a different perspective). So far, there is no title or release date info for the new series. Expect it in 2012.
I can't wait to read Last Sacrifice, but also excited to know who the spin-off series will be about.
From her blog:
And finally, you know what else? Throughout all of this, plans are coming into motion for the VA spin-off series. I'm still quite a ways off from writing the first book (say, like, September), but those who've heard me at signings know that I have to have the whole series planned out before I start it. So, I'm now hacking away at that and finalized the preliminary premise for the series, as well as a rough outline for the first book today. I think it's going to be fun. It's different from anything I've done before, and there are two characters who are so awesome that I don't even think they need a plot. Coolness will just ensue whenever they walk onto the page. And even though the series is a long ways off from being written and published, we can expect info trickling in this year for the series title, first book title, etc.
I'm also ready for books 3 and 4 in her Dark Swan series. :)