Stargate: Origins was announced! And what´s more, it appears that they will keep SG1 continuity. 

Details: https://amp.reddit.com/r/Stargate/comments/6okvak/stargate_origins_details_we_know/

Let us know what you think in the forum: https://stargate-eaw.de/index.php/en/forum/default-topic/4067-finally-more-stargate