with regards to roster management, i'm not seeing any major changes from last year's rules.
taxi squads of up to five players are permitted. if there are five players, one must be a catcher.
if you're placed on the covid-19 injured list, it's a restricted list, and you're removed from the 40-man roster.
modification to the "outbreak" rule (defined as "significant" in this article) . . . it also allows teams to place players on a restricted list if they cannot meet the vaccination requirements to travel into canada. if the number of players is significant (last year it was three or more), then replacement players can be added without having to return them via outright waivers or optional assignment waivers.
presumably, this "significant outbreak" rule would affect the new york yankees and new york mets if new york city's private employer vaccine requirement remains in place.
also presumably, this means that a 40-man player who had been on optional assignment that is promoted as a replacement during significant use of a covid-19 restricted list would not burn one of his five options turns when returned to the minor leagues.
what i believe is a new ruling: if a player tests positive while designated for assignment, the designation shall be negated and he would go on the covid-19 injured list.
still unknown: will unvaccinated players be forced to go on the covid-19 injured list if deemed close contact with personnel testing positive, and will the requisite be seven days and a negative test at the conclusion of those seven days? again, we know that jace peterson went on the covid-19 injured list last year because he was unvaccinated. even if he had tested negative each and every day during those seven days, he couldn't come off the restricted list.