After some testing I can confirm the extended factory banks and the extended user banks are mirrored. Whatever you put in one gets mirrored in the other. Not sure if this is a bug or a feature but I hope it gets fixed, otherwise it would be rather disappointing.
Confirmed also on my side.
This is clearly a bug or at least not a feature.
If there are no extended factory banks, we should not been able to select factory banks from 9 to 16/G.
If there are really 8 extended factory banks (9 to 16/G) as stated by cbmd on GearSpace, then they should be different from the user banks 9 to 16/G.
@tomcc,
I don't know if it's possible to edit the thread title to make it clear that this is a bug in the beta OS.