Its possible but for our resources and the scalability of that kind of feature (I know, its cool and we love it too) the rest of the Pyramid Flipper would suffer
Look at YotaPhone: it costs much more than similar spec but it has the e-ink screen on the other side!
Its cool but I think we're going to have to put it into the think tank for a while.
If Pyramid Flipper will be truly succesful, we can might be able to introduce this idea (in a reasonable extent) as an extra accessory keyboard!
In hardware industry, the tough thing is that not all ideas can be realized. The key for eve.community to create cool products is kind of similar of building cool lego builds (or something along those lines), you have to;
1) Find the components to do it (developing new hardware is REALLY expensive)
2) Be sure your components are available now and during the lifecycle of the product
3) Find a reasonable balance between the value and the cost
That's all easier said than done