According to a post at the /r/RedDeadRedemption subreddit, someone posted that they got the option of online migration, which allows players to carry over their multiplayer profile from the two different versions of the game which was the case with the enhanced version of GTA 5 between GTA 5 from PS4/Xbox One to PS5/Xbox Series.
You can see the full post by going here, and you can see that this could be another hint for the long rumored RedDeadRedemption 2 PS5/Xbox Series port which many fans are hoping turns out to be the real deal.
We still have to wait to hear from 2K Games or Rockstar about the announcement, but hopefully we hear one sooner rather than later.