Thinking out loud
1) Less than 8 full weeks played, full refund
2) 8 full weeks played but season not completed, prizes awarded based on standings
A) record
B) points scored (or "breakdown" in CBS leagues
3) Expanded roster for covid scratches
4) late roster changes for covid scratches (but not too late, maybe a few minutes in) Maybe
5) if a manager can't field a team because of covid scratches, then stats from the makeup game or their next game will count (I think the NFL will do everything possible to prevent this)
The most important changes will be when does a season become official and special roster rules for Covid coverage