I just looked at the trailer upload, rather than the stream and yeah, it looks like there is something around the bird head. Upon rewatch I also see some particle fizzle around the little fires in the sequence opening. If there is temporal upscaling here, it's subtle, and low on artifacts, which is great.
OP
@Dakhil has asked us to keep things on topic. I'll say that I, personally, didn't
love how Prime 4 looked - I've not played any Prime game but
Remastered so I can't say to what degree this visual design is an extension of those games - but from a technological level it's clearly a polished product in the vein of
Remastered. I will just gently remind folk that if they looked at the stream, they didn't see the footage at its best, and for me at least, that looked really rough. But that's just compression artifacts.'
Model complexity is exactly in-line with Prime Remastered, and while pixel counting a YouTube video is a fool's errand, it looks like the same 900p+MSAA that
Remastered used. Big open areas, but I didn't see crepuscular lighting or volumetrics. The little fires in the opening display very similar emissive properties to the same effects in the frigate in the
Remastered opening.
I see one real instance of pop-in - the final baddie posing as Big Bad comes in looks like a failed animation tween, but it's a
very delayed load of a higher quality model. It looks real bad. And the explosion right before looks like it runs at half frame rate? But all the other particles seem to be 60fps. It all looks really well polished.
In terms of new stuff, there are some subtle lens flares that I don't remember from
Remastered. And the areas are obviously larger, but distant objects don't look like real geometry to me, and lights are mostly static, in keeping with
Remastered's forward renderer.
Prime 4 does not appear to be a technological leap over
Remastered in any major way (unless those hints of temporal upscaling are real), which is no bad thing, because
Remastered was an absolute consummate game for the hardware it was developed for. This is peak Switch 1 technology, exactly what you would expect from a game that was designed for Switch from the first day to the last day.
Which is not to say it won't launch in the cross-gen period, or that there won't be enhancements on Switch 2. But this isn't "RTGI replaced with something else" this isn't "4k struggle bussed down to smeary 720p" and this definitely isn't "high poly models replaced with low poly models." It's Switch 1 tech through and through.