What is or is not going on with Cyberpunk is a whole rabbit hole:
When Phantom Liberty launched, as Foggy said, CDPR did say that this was it until the sequel, other than a handful of bug fixes.
Then 2.1 came out with new features, with one of the senior devs asking what cyberware players would still like added.
Then CDPR hired Virtuos. The assumption was for the Switch 2 port, but Virtuos is much more known for full on remakes and advanced remasters, not port jobs nowadays.
And indeed, 2.2 then came out with more new features, apparently all done by Virtuos. Needless to say, if you're hired to port a game, you don't start by adding new features to other versions of the game.
Then this year there was a mountain of circumstantial evidence:
CDPR's revenue projections for the Cyberpunk brand for the next fiscal year were very high, far higher than what Switch 2 sales of CP2077 would realistically account to.
The official CP2077 twitter started putting out a birthday calendar - and ended with six 'Encrypted' slots. The branding is explicitly CP 2077 Ultimate Edition, implying that whomever these new characters are, they would appear in the game (not just in associated media like the anime).
We then started getting voice actor hints and resume leaks that they are indeed working on DLC. Note that DLC in CDPR terms is (usually free) point release content, not expansions.
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So it's highly suggestive that
something is coming to the game beyond minor features like we saw in 2.2. My guess is a series of missions (that may or may not be paid for, remember the fiscal year comment above) that explicitly tie into the next anime release:
1) It's the best way to actively push consumers to cross over from one media to the other.
2) The biggest issue with adding minor point releases over time is constantly getting the voice actors back to record new lines (especially given the sheer number of languages games are localized to nowadays). But if they have the anime voice actors in the booth, it would be very cheap to get them to record some extra lines for the DLC while they're already there.
But there's really no evidence for that - as Mahes said, it might be sequel prep (it sounds like Witcher 3 is getting that), but imo Orion is years off, and I doubt that.