The Seinfeld compilation is in pre-production for DVD as we speak. There was a lot of legal battles over royalties with the release. The only two original contracts that stipulated royalties would be given were Jerry Seinfeld and Larry David (co-creators). None of the other cast members were contracted to receive any type of royalty from the deal. Apparently they felt the need to include the commentaries and documentaries of the characters in the DVD set so there has been a re-negotiation and ALL characters from the series will participate and ALL will receive negotiated royalties.
My guess is the set won't be released for another year but I have heard MAYBE by the end of this year.