Make a thread once a week with upcoming releases that week (maybe highlight ones that are >= 80% on RT in the title)
Maybe make a separate thread, like once per day, for ones with >= 80% RT?
Personally for me, I feel like I would prefer to have separate threads for highly-rated movies; I feel like the generic amalgam of what's-coming-out probably won't be as useful / popular as separate threads for individual good movies that are coming out.