Let me put it to you this way, AROS X86_64's modular kernel will be LGPL'd. Gotta lot of hopes in 07 for AROS.
I would find it much more interesting if you implemented some kind of emulation layer, which will allow you to turn 68k apps and games. I see no point in native 64bit version when you still cannot run anything on the OS with the exception of uae and lunapaint.
The OS itself seems very promising, but it sadly just aint of any use to me when i cannot do anything but play with the gui and a few demos.
So i think emulation and native software should be of much higher priority.