We are developing a new board with atxmega core. But as many people have an XPLAIN developer board, it was a good point to start. So the software will be designed for the XPLAIN for the first release.
I only do it for fun and because I have two XPLAIN boards on my desk... I want to use them for tinkering and the Arduino API really helps me with prototyping.
So soon we will have a prototyping platform with 8MB of RAM and 8MB flash memory... and of course we use the on-board USB connection of the XPLAIN... of course I would not use it in a 5V project... just pick the right hardware for your project.
A first beta version will be out next wednesday (17.02.2010) and maybe all people with an Atmel XPLAIN or other atxmega board can send me a personal message. We need your help.