Welcome back! Biggest new thing is definitely the Fontaine region. Excellent story, amazing music, very pretty scenery.
Artifact-wise, the new Fontaine domain has new BiS for Fischl, Xiao, and the Fontaine cast. Marechaussee Hunter for Xiao + most of Fontaine chars, Golden Troupe for Fischl, Furina.
Characters, Wriothesley is on the current banner. Cryo on field normal/charged attack dps. Furina banner is coming in 2 weeks. Charlotte will also be coming in the new patch, but don't know which half she'll be released yet. (Furina is hydro archon, Charlotte is a 4* fontaine news reporter).
Not sure if you would like to know about leaks for the next patch so i'll leave em out for now since idk how to spoiler on Lemmy, but lmk if you're interested and i'll tell you about them!