From a Syfy Australia tweet:
#SGA and #SG1 stars will appear in #SGU Season 2, says Brad Wright.
On Set of #SGU today. The general gist of Season Two: The Destiny has a destination of literally cosmic importance.
On the set of #SGU tomorrow! If you've a question for cast and crew (including Robert Carlyle) now's your chance! http://bit.ly/c9LT0d
Interesting fact: #SGU door mechanical door 'nobs' can be programmed to move at different speeds. All are practical. All cost $500.