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I think to Arduino, Uno just means 'Uno form factor, with shield pins in the same place'

Which is kind of sad, since the Uno pinout is horrible for high-speed signals

FYI the new Q has two 'high speed connectors' on the bottom side, for signals like CSI, HDMI, USB 3.1, etc.

Haven't seen any examples of bottom 'high speed' shields yet, though. They said there would be some made available.

Well, if all the interesting signals are on the mezzanine, what's the point of the Arduino form factor and pinout? Just to claim that they're supporting a widely used platform? Engineers can see through it.

The more I look at it, the more it sounds like a platform designed by M&A team

Depends on the MCU, but generally STM32 is 1.7-3.6V

STM32 is 3v3 logic.

Not necessarily; see above (Or a datasheet)

Yes, but many (most?) of them are 5V-tolerant.