They haven't mentioned it anywhere, but non-upgradable CPU/GPU/RAM/SSD would be a massive deal breaker.
Also why announce it without a price?
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I expect to see this and the Deck try to follow locked hardware revisions every few years, just like a console, to allow the verified program to work effectively.
This product is so not aimed at those of us already building our own gaming boxes, but I'm guessing more a way to tempt those who have only ever owned gaming consoles into the Steam ecosystem.
> https://www.steamdeck.com/en/verified
FWIW some early access previews note the box does have a socketed M2 SSD and what looks like upgradable RAM.