Sakura is mentioned during the HSR x Fate 4.4 collab.
According to Mortis, she's expected to be the next playable collab character.
Via hiragara
#HonkaiStarRail
@Th3_W1IIow Honestly Lydia was already amazing on her original season, it was just that she was up against heavy hitters in every corner. There was Lexi and Onya who were all rounders, Arrietty and Sam in the fashion scene, Jewels being Jewels. And Suzie tooting
She’s exactly an example of why queens need to wait a few years before coming back
Its not often we get a case like lydia who can come before her og season even finishes filming and glows up