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Raspberry Pi 5 revealed, and it should satisfy your need for speed
(www.theregister.com)
This is a most excellent place for technology news and articles.
It does support m.2 (and presumably other single-lane pcie devices via a HAT apparently.
So that's an improvement
While true m.2 is available as a bulky Hat, I wonder when they will start using the underside more. There is so much space where e.g. a m.2 slot would have fit perfect while still keeping the whole system slim.
To be fair it doesn't have to be a hat. They have the pcie lane rigged up to an FPC connector similar to the DSI ones. So someone could easily design an m.2 drive enclosure, PCB, etc that just accepts the FPC ribbon and you can mount it wherever you'd like
I mean the M2 I feel for most uses it would mean extra costs just to be unused the hats makes much more sense.