Comment 3 for bug 294791

So turns out this is an xorg issue, at least for me.
First, pressing Alt-Ctrl-F1 worked.
Second, seems that some of the xorg use of the mouse and keyboard changed. Im no expert but if I get it right, your xorg.conf should not define mouse and keyboard any more. The nvidia-xconfigure isn't updated for this and so if you run it, you get into the kind of trouble we're getting. Im not 100% sure but I think the X-server recovery program (when booting into recovery mode) also generates a file that is at odds with the change.
I removed all reference to mouse and keyboard from xorg.conf (including in the layout) - system is working but I can't say it won't freeze.