HW Expansion : Not that I'm aware of.

Donations : https://www.kde.org/

Thanks for the support :)

I would image it should be able to run on Ubuntu phones. Also, and I'm guessing here, Tizen devices, if we ever get them.

And that, I have no idea, sorry. :D

I guess that if it works with Ubuntu Touch, like Nexus 4 or the Meizu.

I sure hope. This would improve affordability for anyone who wants to create startups with hardware.