Thanks for all the replies. Two years ago we had connecting cat 6s during off season cruise in October and really enjoyed them. This time around we are going Thanksgiving and booked porthole rooms instead to keep the cost about the same. My wife and kids actually really liked the big portholes (my cousin had one next door to ours on our last cruise) and aren't anticipating being disappointed, but I must admit I am already missing the idea of putting the kids to bed and sitting out on that balcony at night.
I'm certainly not expecting an upgrade, but was curious as to whether it was in the realm of possibility.
Also planning to get to the port super early, so I could always ask about paid upgrades, but there again I'm guessing that on a Holiday cruise there will be very few rooms - if any- that go unsold, let alone 2 connecting rooms...