OP dunno if u noticed but even in trailer we had 2 kinds of graphical quality:
1st kind- good but not cgi lvl, aka what u can expect in in engine cutscenes ingame (everything with lucia for example and her clyde;p)
2nd kind- where we see all those vids from tv/social media in game, thats cgi lvl(not top marvel cgi, but definitely nothing ingame/in engine), think of it like gta5 tv channels, here it looks like they are tv channels or maybe gta's version of yt/tiktok? U can recognise them right away coz they either got some "news alike" subs in there or comments like u can see on social media vids.
Game coming earliest in 2025, likely september like gta5 coz its best moment, they got plenty time to work on it, graphics included, but dont expect graphics in actual gameplay(no cutscenes/cgi in game, actual gameplay) to look as good on base ps5, by then we will definitely have ps5pr0 so here could be the answer, tldr ps5base- 1080p30 or some nasty upscaler, and ps5pr0 hopefully will be well above that.
About if ps5 gonna produce better graphics from maxed rdr2 on pc
Base ps5 will produce graphics even more complex and impressive, but it wont be 4k100fps like in that vid, but likely either 1080p30 or some weird upscaler from even lower native resolution at 30fps(hopefully no dips but who knows, still over 1,5years till game launch)- it will still look amazing, just not crazy sharp/crisp like full fat 4k native can look and not super smooth that 100+fps make it feel.
Remember we still working in console space here- aka closed box, u can have one of the 3- super impressive visuals aka bells and whistles or 4k or high fps, if u go ham on 1 of the 3, other 2 things cant happen- there is a reason most current gen games got fidelity/performance modes, and even those fidelity modes look far from what we saw in gta6 trailer, even if we only look at in engine/ingame cutscenes from that trailer.