There is loads of info on MJ's Facebook page.

Most relevant is this post, where they discuss running other distros.

Statement of intent:

"MJ Technology LLC Our goal is to make a superior tablet both quality and hardware that a consumer can decide what they want to do with it. Whether that be dual boot Windows/Linux or multiple distro's of Linux. We want to put the power back in the consumers hand to be able to make the choice. Make all the software decisions they like and we will assist them by working on all known viable Linux distro's. It will take time but that is our goal here at MJ Technology LLC. Ubuntu is the mostly widely used consumer Linux distro therefore it was the most logical choice (with which to begin)." (Reference, 1st comment)

Note: I have no connections to MJ Technology or Canonical and post these links and quotes as they address matters raised by Talk Maemo users.