I don't get why the yellow ones are deemed "preferred" (except maybe the luv seats). I am also surprised the exit rows don't have more leg room.

I wonder how this will pan out upon check in when all seats become the same (no up charge). Maybe a middle seat with more legroom becomes more desirable than an aisle or window elsewhere?

I think one of the videos I saw said they expect this transition to take 2 years. I wonder if they will start charging for the blue and yellow seats during the transition (even before they install the increased legroom seats). I have also been wondering how the windows will line up with the changes.