Have considered the cosmo ...
But believe in waiting for devices to prove themselves functional for the end user first....
I want to see a good year or more of feedback from owners concerning how well it works, how good support is, how good company warranty is, how good...etc.
EVER EVER EVER before I start throwing money after promises again.

"also in normal linux a "maemo" DE would be possible"
There is Leste ..for VM...
But that is a different kettle of iguanas ..

Frankly I think a separate thread under Desktop Environs or under Alt
is a good place to start this.

I am completely behind a Maemo DE for Linux.
Esp. considering I spend most of my time on my toshiba m780's ....highly linux compat. ...runs very nicely any variant I have thrown at it......(m780 are convertible tablet laptop with touch and pen.
Makes for an ideal candidate.)

(as a matter of interest there is the very old maemo knoppix linux which had a layout that is maemo retro from back in the early years of the 770 and n800...it would be interesting if dissecting and drawing off it were possible)