>>Colour would be nice too, but I guess that's impossible.

Well, not possible yet[0]. In a few years the technology might be refined enough though. I also heard that the refresh rate is in the range of minutes for now, but let's hope that'll change soon :)

[0]http://www.businesswire.com/news/home/20160524006209/en/Ink-...

Edit: added quote I was responding to