Just watched Continuum. It feels very much like just a much longer episode of Stargate rather than any sort of finale (a good thing in my opinion.) Central plot has to do with B'aal changing time, but thankfully they downplay this enough to not ruin the story's credibility. Some time travel stories just don't work well, but this one does in my opinion.
I liked it much better than the previous movie, because this one doesn't have a deus ex machina ending like that one did that magically solves everything. (ooh, magic box that mind-warps the Priors)
Primary action occurs for most of the movie occurs with Mitchel, Carter and Jackson, but Jack O'Neil shows up briefly in a bit more than a cameo role and Teal'c and Vala play important supporting roles. Landry shows up briefly and Hammond also is present, although only for one scene. No sign of Landry's daughter and little character interaction with minor figures such as chevron guy Walter.
All in all I feel quite satisfied with the movie. The lack of it acting like a finale makes me hope we'll see more of the characters in the future (certainly from time to time on Atlantis).