I just feel like it is the last season because there are no BGC related things coming on Oxygen for the next year right now, and they usually film new seasons very quickly and we haven't heard anything yet about casting calls etc. Also, it seems like Oxyfen is rushing to get BGC13 out like they really want to get BGC off the network for the new year.
Good point
They are usually taping the new season while the current season is airing (BGC12-BGC13), so unless they start casting(?) or taping a new season this fall, the network is either benching or canceling BGC.
Are there any other Oxygen shows that bring in 1+ mil viewers? How does Sisterhood of Hip Hop do?
Paula looks like her breath stinks and without her makeup she is pretty fowl looking. Jenn is alright but her weaves be looking a hot mess. Jonica might be one of the ugliest females i've ever seen, she looks like a black bruno mars with no makeup and she probably smells like halal indian food rotten.
They are usually taping the new season while the current season is airing (BGC12-BGC13), so unless they start casting(?) or taping a new season this fall, the network is either benching or canceling BGC.
Are there any other Oxygen shows that bring in 1+ mil viewers? How does Sisterhood of Hip Hop do?
Preachers of L.A.
Sisterhood of Hip Hop doesn't have ratings available but I imagine it does quite well.
The rest of the shows barely scan 0.5 million
Queen Mehgan 
This is going to be good, much better than S12 hopefully, it was the pits cast wise.