Here are a few of mine:
a. for the piano:
1. an even better keyboard with full repetition possibilities (of course)
2. alternative tunings (including at least one user temperament)
3. even more RAM (of course)
b. for the samples:
1. XL samples, fully mapped, with dynamic range > 40 dB
2. larger e-piano samples
3. larger cembalo samples
Add yours...

Edit: This thread began as a wishlist for the (then unknown) Nord Piano 2. As it happens, several of the wishes mentioned in the thread remain unfulfilled in the NP2 so the thread can - for the time being - be seen as a generic wishlist for whatever incarnation of the Nord Piano.
