I've played two of the games (sadly no Demon's Souls) and most of what you listed (outside the obvious qualms about it being technically sound, phantom hits, graphics issues, etc.) really weren't things that I factored in to why I liked or disliked the games. I guess it comes down to what you want from the series but From could do most/none/whatever with most of those features/mechanics and I'd probably still find it as fun as the other games. I think the only thing that I would be upset about is if they didn't have a covenant devoted to beefing the game up a bit, a la the company of champions covenant in Dark Souls II. That and hopefully their bosses are more Bloodborne/Dark Souls inspired over Dark Souls II, but I won't complain either way as long as they're hype as fuck.
IIRC SL PvP & CO-OP was confirmed, so no more of that soul memory crap. Fingers crossed.
I'm more interested in the general combat, it was pretty grim in DS2.
Ripostes were so slow to use, blocking on reaction didn't work properly so you had to have your finger glued down before attacks happened, and those 360 spin auto tracking enemies... Yeah, I just love avoiding an attack just to see them do a spinning top impression and hit me regardless. -_-
The world design was piss poor sure, and fast travel from the start was a dumb fix, but it really was all the wonky combat that killed it for me.