OK, some work on the more difficult UI part, the home screen...
Bigger screen is cool, but then we need to find a way to use it - here are a few drafts, trying to keep the same philosophy as on the 9X, and reusing elements where possible.
Inputs match what we know of the radio at this point (8 switches and 4 pots), labels are dummies of course, they'll match the radio labels (apparently SA, SB, SC... for the switches), with ↑ - ↓ appended for the position.
The top half keeps all the "important" information so it's always visible, namely model name, (12 chars), flight phase (now 10 chars as Bertrand mentioned earlier), both timers so we don't need to change screen, radio voltage, a 2nd voltage (RX or flight pack).
The bottom half like now, can change between pages:
- One page shows the inputs and a little logo (a few standard ones to choose from for various model types, plus possibility to load a custom 64x32px bitmap off the SD card).
- 2nd page with output bars, same as now but more on the same page:

- home2_b.png (9.93 KiB) Viewed 11400 times
- 3rd page with numerical values, still like now, also 12 per page:

- home3_b.png (9.9 KiB) Viewed 11400 times
Any comments?
Of course it looks quite busy, but like now any unused feature (flight phase, timer, RX voltage...) would leave more empty space. We have screen real-estate, better use it!

- less.png (11.14 KiB) Viewed 11400 times