I believe (and truly hope) that GW is just waiting for some last minute details before updating the schedules. I read somewhere (?) on the A10 site that all non-nationally televised A10 games would be streamed on ESPN+. That was awhile back, so I'm not sure where I read it from.
Also, if you go to ESPN+ and look at NCCAW games, it lists GW's opener with AU as an upcoming on-demand game.