Whoever said "no x11 or ubuntu" has no clue how things work
X11 is not an OS; ubuntu is a distribution, just as Angstrom is.
Distributions have default and optional packages; you can run Ubuntu without X11, or Angstrom with.
Both Ubuntu and Angstrom generally include a full X11 desktop as the norm.
Pandora of course is based on X11 normally, but you can of course do as you like; well almost certainly release the Angstrom recipe so others can build the full distribution if they want, or alter it, but of course..
You could just run Ubuntu (if you want bloated), or somethign really minimal, if you dont.
ITs open, do as you see fit, and people will

How much do you bet there will be 5 distributions after 1 month?
jeff