Can only imagine that the build script/packaging needs updating to cope with the new 3.7 based RCs and dailys.
I'm sure the kernel team will sort it in due course.
3.7 merge window opened on 3rd October IIRC.
_all.debs went MIA on the daily builds from 8th October onwards.
So while the 3.7 merge was not complete at that point, a fair part of it had been already pulled.
i updated my kernel update checker script