Thomas Dekker and Brian Austin Green were at Starfury and got asked about all this Sarah Connor Chronicles movie talk at a Q&A. Jenkehs from the TSCC wiki attended the panel and reported back.
The gist of it all is that James Middleton and Brian Austin Green have been working to get a Sarah Connor Chronicles continuation movie. Josh Friedman is going to be asked to return, along with writers Zack Stenz and Ash Miller. This movie would complete the story as it was originally intended and if it were successful enough, a sequel could perhaps follow.
• Here's the wiki thread about it.
• Jenkehs also captured a bit of audio of BAG's reply.
So there you have it. TSCC. Movie. It will happen. It's just a matter of when.
There is NO freaking FATE, but what we make!