If the Republicans do wind up winning both, the Democrats can basically force them into 1 district after 2012. It will be interesting to see where thy put Bridgeport, given that without that city CT-4 becomes a Republican-leaning district.
As AndrewCT said, I don't see how they can split CT-04. It's basically the Connecticut Panhandle by the New York border along the LI Sound Shore. Moving Northward along the CT border instead of into Bridgeport probably wouldn't change the makeup of the two districts much. I suppose they could split off the more minority parts of Stamford and put them into a district with Bridgeport and into New Haven, but that would probably make CT-03 more competitive. Plus, CT usually doesn't split towns without good reason.
No, you can draw a district that is all of Fairfield county except Bridgeport and the areas immediately east of it. It would actually be better looking than the current map, to be honest.
Again, you wouldnt be able to do it. The only thing you could do to Bridgeport is to put it into the CT-3, but than you would be lumping Bridgeport and New Haven into the same CD, leaving the 4th with significantly less people. You would have to take Danbury and add it to the 4th, and even then it wouldnt make up for the loss. It would take MASSIVE population growth in Shelton, Westport, Weston, Wilton and towns like that to make Bridgeport a central CD, and put Norwalk, Greenwich, and Stamford in the same.