Bright,
You are assuming that he's met someone and is getting serious about them. He may not be doing that at all.

Many of them don't acknowledge their family and friends when a holiday rolls around. I think your h is a very slow MLCer and he's just hit the spot where they don't have much contact. I could be wrong, but I don't think so.

Two phones....well...he could have a personal phone for his use and a second phone for business personnel to contact him. Or, as you said, he could be considering terminating the old phone and trying out a new phone to see how it works for him. He certainly wouldn't need a second phone to keep things private from family and friends, as he really doesn't stay in touch w/them and he's not around them all that much.
So, I don't think there's some secret intention behind them.

You are trying to see into the crystal ball and it's not ready to reveal things to you. Your analyzing and mind reading of the holiday will drive you nuts if you allow it. Remember....uRworthy and others have pointed out how nutty they get around the holidays...so this is an "oh well, his loss moment from Thanksgiving".

Continue to move forward. Life is far too short to try to analyze his every move because assumptions sometimes aren't on the target and look at how much time you would have spent on assuming something and it didn't really happen. Enjoy your life and if he should wake up, he's going to ashamed and sorry for the way that he's treated you and others.

Enjoy your weekend.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.