Re: Can't replace the battery?
Throw away instead of charging... Not very green is it!
And at that price, not what I'd call disposable.
I'm sure given the silicone construction, it wouldn't be long before someone cuts it open and finds a way to power it externally.
Now the other problem I see is the layout. I can't imagine it's too nice to type on spaced like that, and it also limits the user base... If the gap is for a smartphone, a Nexus 7 won't fit. If it's 7" tablet sized a bigger one won't fit, and phones will look a bit lost in the middle.
Surely a better design would be to have a standard keyboard layout and have the NFC part unroll to the top? (and a way of charging it of course).
I think I'll stick with the Nexus 7, OTG cable and mini USB keyboard all the same. Somewhat cheaper and not like typing on dead flesh!