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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.
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