At this point, it's actually somewhat of a surprise that Xbox hasn't moved Bethesda's Starfield over to PS5 yet given everything else that's been ported to the console - but it sounds like the plan is for that to change in the near future.
According to prominent leaker NateTheHate — who was heavily involved in all the Oblivion Remastered rumours — Microsoft will announce Starfield for PS5 in 2025. The insider doesn't say whether the actual game will launch this year though - just that the announcement should arrive before year's end.
Nate went on to say that they "expect the gap between announcement and release to be minimal", so if the port is revealed sometime this year, it's likely the release will follow shortly after. This lines up with other recent Xbox-to-PS5 ports which have typically had a few months between announcement and launch.
This is just a rumour for now so it's best to take it that way - but given the leaker's recent track record, and Xbox's big multiplatform push recently, this all sounds pretty likely. Will we get another Xbox expansion alongside it in a similar vein to Shattered Space? Who knows, but Bethesda is definitely still supporting its spacefaring RPG here in 2025.