I doubt that they would use a screen smaller than the 13” but they might shrink the bezels enough to get the overall package pretty close to the size of the 12”

I doubt that they would use a screen smaller than the 13” but they might shrink the bezels enough to get the overall package pretty close to the size of the 12” MacBook. I had that 11.5” Air and it was my main computer for several years. Amazing performance for such a tiny thing. Mostly connected to an external display when at home.