The actors who play the core Kent family - Tyler Hoechlin, Elizabeth Tulloch, Michael Bishop and Alex Garfin - are the only ones who will appear in each episode.

It's possible that the seven departed cast members could be seen as guest stars or in recurring roles, but that's only if they're available to appear. and if the budget allows. The cuts were made as part of cost-cutting measures, and the fourth season will only have ten episodes next season.
For one cast member, the role has become bigger in season four. According to Deadline, Michael Cudlitz has been promoted to regular cast. Cudlitz joined The CW this season as the new face of villain Lex Luthor.
A start date for Superman & Lois season four will be announced at a later date.
Watch a trailer for the third season of Superman & Lois introducing Cudlitz's Lex Luther below.
