https://www.animenewsnetwork.com/news/2023-09-03/kimi-ni-todoke-anime-gets-sequel-from-production-i.g-on-netflix-in-2024/.201934

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?