Trailer #1: https://www.youtube.com/watch?v=0Hvc7E_3SXs
Trailer #2: https://www.youtube.com/watch?v=Sb_q1DPuHyo
So far, no one has been mentioned that was or needs to be replaced.
I assume you mean the live-action version... it's pretty good, but leaves out some stuff that is in anime.
I guess this will cover the start of college? Probably Soulmate? Doesn't seem like there are enough volumes for a full S3... maybe the author will add original content for the anime and backfill for the manga?