Burnie hasn't said anything.
My guess is that an anouncement is coming soon.
Burnie said they'll be rolling out a brand new Red Vs Site sometime soon, so I'd expect an anouncement when they do this.
They have a new miniseries called Recovery One, but I expect an announcement of a new RVB series soon.
Red Vs Blue: The Blood Gulch Chronicles lasted 5 seasons.
This new Red vs Blue series will be called something else perhaps.