MGM has announced they are creating a new Stargate series called Stargate Origins. It will be a digital-only series consisting of 10 short episodes that together would form sort of a movie. The focus of the series will be on the early life of Catherine Langford and her early experiences with the Stargate.
The series will be offered on a new MGM portal called Stargate Command. Some of the content will require payment.
These articles provide the MGM press release and a trailer, which is all from the original movie:
This article in Vox has a lovely description of Catherine Langford, including Daniel’s attendance at her funeral.
See also our wiki article about Catherine!