DarthParametric

Well they had no choice for Xbox at least. MS requires that all Series X/S games are backwards compatible with Xbone for the next 2 years. But that's really a non-issue. The game is capable of running better (although still pretty gimped) on Xbone S and PS4. Just like Red Dead Redemption 2. The problem was CDPR management pushing it out the door probably a year ahead of when it should have come out.

I remember a dev report where they claimed Cyberpunk was barely out of alpha status in May 2019. Since then they were crunching up to 16h per day on 6 days a week. 

Thats some serious mismanagement here. Glad they cut the game shorter than W3 to ensure quality  though. 

Do you think there's a chance they will patch in those abandoned features like wall running & subway via later DLCs? Especially the subway/railway is a must in terms of immersion,  to be able to have some sightseeing at sections above ground.

The demo we saw at the end of 2018 was absolutely a vertical slice, not an actual game. So my position has always been that the game as released was only in development for around 2 years, at most. That means the original April release date was an outright lie that was never realistic/never intended to be hit. It's very much a repeat of the Anthem situation, where the game languished in pre-production for half a decade without achieving much. And like Anthem, I expect we'll get an exposé from Schreier revealing some of the gory details in due course (he apparently already has some sources and is soliciting for more).

As to future changes through updates or DLC, who knows. However, I would be very surprised if, mechanically speaking, the game changed significantly given all the other problems it has, so don't hold your breath for stuff like train rides. Wall running may be a possibility, but I'd put it low on the likelihood list. That's one of the things that likely never actually existed outside the vertical slice. There are some things that are actual cut features though that still have remnants in the game files. Stuff like cloaking/invisibility cyberware (similar to Deus Ex), which is actually used by at least one enemy in the game but was originally also available for the player. Other things that might pop up in DLC would be decorating V's apartment, getting a new/upgraded apartment (apparently there is one upstairs in the megabuilding you can reach with the double-jump cyberware). An expanded crafting/upgrade system seems likely, since this is the sort of thing TW3 did with its expansions.

Everything is really up in the air at this point. The current state of the game and the time/resources required to fix it, plus how much of a knock-on effect that has with the multiplayer spin-off they are also supposed to be launching in a year, have probably put a crimp in whatever original plans management may have had. They are probably also in a bit of a bind logistically, because normally by this point post-launch DLC would already be well into production, since you need to keep your team occupied once they finish up their work on the main game (unless you just sack them all, as is common industry practice). But they probably have a lot of heavyweights, especially programmers, tied up working on patches that normally would have been cycled out by now. That's not only going to slow the whole DLC pipeline, it probably also means curbing any radical ambitions so as not to create any new problems. I would not be surprised if they actually end up scrapping some/most of their original DLC plans. They originally said to expect more than TW3, so presumably at least 3 expansions, but maybe they will decide to just cut their losses. But as I said, who knows at this point.