Steam Frame release is being held up by Valve as it's still finishing ‘Gamepad Mode’

The Steam Machine isn't doing exclusives because Valve thinks "restricting where people can play" doesn't work: "We’re much more interested in having the whole PC catalog as our 'launch exclusive'"

Experimental Build Of Holo Core Published: Arch Linux AArch64 For Valve's Steam Frame

Valve appears to be discontinuing self-repair parts for the LCD Steam Deck at iFixit