OK, so I have spoken to ereader-store.eu, and it seems that the M96 should be available to buy from that site in the next two-three weeks.
I have also spoken to Onyx, and they say that they are not currently working on a 13.3" model, and the M96 model won't have an HD edition, since 'PVI (Prime View International) does not produce the HD screen in 9.7"'. But the M96 will have the
A2 screen refresh mode, whatever that means technically.