Merrick here...

None of this is particularly surprising given that similar cross-pollination occurred between STARGATE SG-1 and spinoff STARGATE ATLANTIS.

Hollywood Reporter has a quick piece on which STARGATE franchise faces we can expect to see, somehow, in the forthcoming STARGATE UNIVERSE.

Four veterans of the "Stagate" franchise, Richard Dean Anderson, Amanda Tapping, Michael Shanks and Gary Jones, will reprise their roles in guest stints.

Anderson plays General O'Neil, the former leader of the elite military team SG-1. Tapping plays Samantha Carter, an astrophysicist and U.S. Air Force lieutenant colonel. Shanks plays Dr. Daniel Jackson, Stargate's archeologist and linguist. Jones plays Chief Master Sgt. Walter Harriman, commander technician of the team.

Additionally, "Stargate" alum Christopher McDonald will play Sen. Alan Armstrong, the U.S. senator and head of the International Oversight Committee that governs the Stargate program. He is the father to Chloe Armstrong (Elyse Levesque).

...says THIS ARTICLE in Hollywood Reporter, which goes on to discuss other appearances we'll see in the new series.

You can find a recently revealed teaser for the show HERE.