Also- something I think the Dems will try to do is take the town of Plainville from the 5th district and put it in the 1st. The (Republican) state rep there is Dr. William Petit, who is the survivor of a horrific home invasion in which his family was murdered. As a result, he has a pretty big platform on criminal justice issues, and even though he advocates for conservative, tough on crime policies, he is relatively uncontroversial and popular. I think the Democrats will draw his residence into a deep blue one to try and prevent a congressional run by him.
Doesn't CT require a 2/3rds majority to pass maps?
Yes, which they have in the senate and are 3 short of in the house. They obviously won't be able to aggressively gerrymander or anything like that, but I think they could do some minor things, like what I mentioned above, as long as it doesn't change the partisanship of the districts too much.