It is working but camera is in some kind of buggy mode. First of all when I try to use zoom, it freezes constantly, not allow me to make zoom smoothly, when I press zoom it move it very little and freezes and continuously so...
I use sd card class 4, I think that it must be using 10 for this kind of high quality videos...
Don't know but this seems quite unstable and dangerous for camera, among that CHDK runs fine without problems so far.