Of course just a regular smartphone-type touch screen keyboard is completely unacceptable.
If the successor doesn't come with a physical keyboard I will not buy it period.
3X. Physical keyboard is a must.
As for being able to dynamically re-map the keys, etc... You all realize that the ICP2's solution to that 'need' was to make a blank keyboard and give people a book of stickers to put on their own key labels, right?
Just do a relatively stock QWERTY keyboard layout and allow compose-character combinations to do characters outside the 'norm'. Yes, it is a one-size-fits-most solution. It is also the only really 'reasonable' solution.
Custom keymats are too expensive.
Swapable keytops are too complex -and- too expensive.
2nd screen with virtual keyboard - too complex and way too expensive both in EUR and power.
A book of stickers to put your own key labels on? What a joke.
*Start with the Pandora's keymat. A few people seem to hate it. I think it's a great solution. Simple, economical, durable, very functional.
*Make it translucent (whiteish).
*Print the key labels in DARK/black.
*Illuminate it from behind in 5-7 places with dimable color LEDs.
*It does NOT have to evenly distribute the light. The lights behind the keys are the visual equivalent of the bumps on the f and j keys - they're visual queues to where the rest of the keys are.
Next?