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It sounds like MGM is really invested continuing the franchise. The first movie sounds like enough to bring the series to a close. The second sounds a lot like the false series ender from season 8.
Below are the synopses for the new Stargate movies:
"Stargate: The Ark of Truth"
As SG-1 searches for an Ancient artifact which they hope can defeat the armies of the Ori, they learn more Ori ships are about to be sent through the supergate to launch a final assault on Earth. Daniel discovers that the artifact, the Ark of Truth, may be in the Ori home galaxy, and SG-1 embarks aboard the Odyssey to find it, and pre-empt the attack. The IOA has a plan of their own and SG-1 ends up in a distant galaxy fighting two powerful enemies.
"Stargate: Continuum"
While SG-1 attends the execution of Ba'al, the last of the goa'uld system lords, Teal'c and Vala inexplicably disappear into thin air. Carter, Daniel and Mitchell race back to a world where history has been changed: the Stargate program has been erased from the timeline. As they try to convince the authorities what's happened, a fleet of goa'uld motherships arrives in orbit, led by Ba'al, his queen, Katesh, (Vala) and his first prime, Teal'c. SG-1 must find the Stargate and set things right before the world is enslaved by the goa'uld.
It sounds like MGM is really invested continuing the franchise. The first movie sounds like enough to bring the series to a close. The second sounds a lot like the false series ender from season 8.