1)Scuttlebutt doesn't work for me, as it doesn't seem to fit in well with everything else. It's a 'themed' category where almost everything else isn't. General Discussion wasn't good either, mind you. I'd call it simply 'Speculation' and leave it at that. There is nothing good or bad about speculation - it just is.
2)Scuttlebutt, however, can have negative connotations. I just wouldn't have it, if it were up to me.
3)Other forums don't need it - specifically Dragon Age: Origins, Dragon Age 2, Mass Effect, Mass Effect 2, maybe Mass Effect 3 (though I'd wait until forums for the next game are set up). There's no point. What speculation? What rumors? What scuttlebutt?
It's totally fine for Dragon Age: Inquisition though, and Mass Effect 3 for now.
4)"The Lobby" has absolutely no point either. It's Off-Topic. We know what it is. You even had to keep it in the name. Ditch the lingo and call it what it is, lol.