Continuing the discussion from One Last UNO Revision:
Ok, let's talk. Start with a 328PB. Keep existing pinout for compatibility, add a connector for the added pins. Put in a switching supply with some oomph.
Other ideas?
AVR128DB48. Certain pins paralleled to put the right functions in the right place.
Switching regulator ala Nano Every.
Real Crystal.
Expose portC with alternate power supply.
Low Iq regulator so that board deep sleep current is circa 5uA.
Make it 3.3V logic.
Switch to an STM32 or ESP32 and have a mode where it emulates a Mega328 
Add an extra row of pin headers that are on a 0.1" matrix so you can plug in DIY boards made on 0.1" stripboard.
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I've never bought one (duty fees make these too pricey for the things I make) but always wondered how well they live up to the claims. Anyone buy from
https://www.rugged-circuits.com/microcontroller-boards/
Oh. I also think it's pretty important that it not cost any more than the current Uno. (I'll note that the AVR128DB48 is currently slightly cheaper than an ATmega328P. (Some of which is because the 328P is priced "high" to encourage the switch the 328PB.)
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