I don't believe that we will see a new Xbox. I just think we would have heard about it by now, and it seems early for a die/body shrink.
I think we will absolutely see new laptop/tablet/hybrid hardware. It's about 6 months early for a Surface Pro 4, but maybe the long-awaited Mini shows up? We will almost certainly see some OEM partners show stuff off, I would think.
On the mobile side, the 435 and 1330 are the likeliest culprits for reveal. I'd almost hope AGAINST a flagship, as we've heard nothing from the FCC, and I'd be worried about the crapfest of announcing it in January and releasing it 2 months later (or more). In a perfect world, the 1030 would show up, but I've just become really pessimistic towards Microsoft's hardware decisions since they took over for Nokia and pooped out budget devices seemingly monthly, while canceling the one flagship they planned.
I don't believe that hybrid laptop/phone device will happen, either. It just logistically seems awkward, and would basically mean we would get an Intel-based phone that I can't see as likely. The hardware simply looks like a vertical slider, a la the Venue, and maybe that form factor could happen. Like I said, I just have learned to keep my expectations low after a year of disappointment.