Another quick update on how Trophies will work with some of the PS1 games coming to PS5 and PS4 through PS Plus Premium: it's looking like titles that support Sony's digital trinkets will feature two separate Trophy lists. This means that you'll be able to earn all of the Trophies twice, should you play the games on both PS5 and PS4.
To be clear, the separate lists appear to be identical in terms of content — it's just that one is a PS5 list and the other is for PS4. Still, this could be useful information for all you Trophy hunters out there.
The new PS Plus tiers are in the process of being released across Asian territories at the time of writing this article — additional PS1 games are being outed right now — so we should know a lot more about how everything works in the very near future.