The question is in the title, but can anyone provide some details on what it is, how it works, and when it will be available?
The question is in the title, but can anyone provide some details on what it is, how it works, and when it will be available?
It's not a "mobile version" of Ubuntu.
It's a special build of the Ubuntu OS that can be installed on Android dual-core phone, with this you can attach a HDMI monitor (and I think a bluetooth keyboard and mouse) and use your smartphone as a computer with Ubuntu.
As an extra, from that desktop you can access to phone data (like addressbook) and send / receive calls.
I think that this image clarify what is it:
Official page for more info: http://www.ubuntu.com/devices/android
It's similar to the Motorola devices webtop app that recent devices have.
You dock it and use your mouse and keyboard to use it as a desktop.
Coincidentally, Motorola has been using Ubuntu for a year on webtops.