I was reading about more capable hacks back in 2005 back when there were people doing attacks against the generic device drivers for
TFA sounds to me like a much more limited attack and not all that creative since we've had a decade+ of USB devices that spoofed multiple devices -- I'm specifically thinking of those spoofed CD-ROM drives on some of those old Flash sticks.
Keyboards? doesn't sound all that useful at 1st glance... but finding a fool proof script to open up a terminal on a mac sounds like an interesting challenge. linux? too much variety. windows... getting to the run cmd is easy.
If you don't have a locked screen saver... which has been a MUST forever... a well written script could just be run from anywhere (just post it online, type in the URL and exec the file) which does most everything you need without admin access but could later also trigger some stuff to attempt privilege escalation attacks... like the police can already buy on usb flash (and whose software is signed by the OS vendor as trusted.)
What would really be interesting are attacks that unlock the screen saver... or some generic driver exploit that allows custom error messages to pop up on the OS... "The radiation shield on your monitor has broken, please sit back 4 ft to avoid being irradiated."
Although given the huge number of exploits and flaws in drivers--- I would like to see something push for greater quality and if that means popular USB stick exploits where it spoofs crap hardware to trigger automatic installation of crap drivers... would be nice to see hardware vendor drivers getting banned/noticed for poor quality.