I think they're waiting for the Minimig AGA to be released to copy their code. 
I thought that this would be possible but the Minimig license renders it unusable by the team. Yes, I've asked this on the forum.
The reality is that the board went from 4-layer to 6-layer to add onboard add Gbit-ethernet and USB. Hence, going from LX to MX has taken longer than originally planned. A PCI slot was removed and 2 more memory chips were also added...
...but I suppose someone looking for actual answers would have gone to the official forum and discovered this for themselves...
[listens for the wolves to cry 'feature creep']
No one wants to buy a computer today that can't get online out of the box...the Natami team included.