The pessimist (realist?) in me thinks the reason MGA Dem leadership is waiting until the regular session is they want Hogan to be out of office (and very likely Wes Moore in his place). Otherwise they'd have to get nearly the entire Democratic caucus to agree on whatever they put forward to override the veto. If they're not worried about a veto they're back to just needing a simple majority which means they can include more extreme measures.It's possible that there are some less than rabid types in the state Senate. They can desk-drawer the really stupid embarrassing stuff. Legitimate legislators don't like to look like fools, and will avoid doing so unless the Party forces their hands.
The optimist (naive fool?) in me thinks that maybe they're taking a wait and see approach on the NY lawsuits.
I hope it's the latter, I expect the former.