I think you're right about Torchwood, mainly because RTD doesn't want to stick around and I suspect Moffat thinks of Torchwood (when he thinks of it at all) with a bit of disdain. Plus, week-long miniseries SMACKS OF 'this show is now canceled'.

I don't know about multi-companions just yet. I think The Moff is going to want to play with his Doctor for at least the first season, but I wouldn't want to bet money on it.