New form factors is an ideal way to imprision users and make sure to annoy everyone who wants to be free.
Mobile, tablets and everything in between is notoriously locked. Even with the Kernel in Android, Google and the manufacturers are making it as difficult as they can to get anything else on there than Android. Ubuntu is a GNU/Linux player with significant resources, and even they can barely do it.
The made in China, make one for all attitude is difficult to penetrate at best, realistically impossible. The manufacturers refuse to make anyting without an enourmous volume, which make sure only the big names get to play. You know them as Samsung, LG, Iphone, Sony, Nokia (now Microsoft) etc. All the phones look the same, no matter how much the companies brag about the differences.
Small adjustments on huge volume systems are possible. But anything radically different, innovative, interesting or in smaller volumes is basically impossible. Getting Linux onto anything is even worse, since basically every board now has their own firmware required to be able to function.
Wishfully we should have a GNU/Linux spring on mobile phones where everyone comes together and just hack the **** out of all the mobile form factors. Kernel/hardware and booting in particular. There are a few open source Mobile desktops, and GNU fits on pretty much anything in different forms.