Richard Dinnick just confirmed Claudia Black and Michael Shanks to appear in 6 eps of SGU.I think they are filming season 2.
Of anybody else from SG-1 to be on SGU, I would have never of guessed Vala.
ETA: sid pointed out in a comment to this post that the six episodes aren't for SGU after all but for Big Finish's audiobooks. Sorry about that folks, I hadn't re-visited the thread where I'd originally seen the mention.
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