Not true. Samsung's Exynos 5250 will launch in Q2 of next year on 32nm node. If Apple stays with Samsung, they could do the same. Historically, they've launched equally or before comparable Samsung SoCs built on the same node. (A4 beat Hummingbird, A5 beat Exynos 42xx in US launch).
I disagree. That's pushing the power envelope without claiming anything back to save battery. I think the next move is to either shrink the 543 and clock it up or make the jump to Rogue cores.
I don't think a Q1 launch is likely given the availability of 32nm/28nm. Apple is pretty much running the tablet game right now, so I could see a February launch if they prioritized getting a retina iPad over everything else, but the benefits of waiting only a few months for a 28nm/32nm node to ramp up are hard to ignore from a battery standpoint, especially since you're talking about a display that is likely more power hungry.