1) He owns no copyrights in the Linux kernel.
2) He cannot retroactively "unlicense" anything previously released with a GPLv2 license. The only thing he can do is "fork" new development, in which case, as I poitned out earlier, the "v2" folks are going to win over the "v3" folks because the majority of folks using the programs are doing so on systems that will be incompatible with GPLv3 (unless they're running something obscure like HURD).
1) we already know the kernel is apparently staying v2, although so far it appears to be the only thing.
2) Yes, Stallman would create new v3 versions of his ~5,000 software tools, and encourage the devs to use the new versions. The can use the v2 Linux kernel on their v3 anti-DRM frankenstein O/S without needing a different kernel, and the anti-DRM folks across the globe willl likely rush to using it just like some use the "all-free" Debian now.