Our team does not yet have the new rotation sensors, but I will put in my two cents having partially created our teams odometry code. The current shaft encoders have 1 degree resolution. With a 2.75" omni wheel connected to each encoder, that gives a 0.024" measurement resolution. Using the rotation sensor spec of 0.088 degree resolution, an odometry system with these should give a resolution of 0.002" with the same omni-wheels.
While this is a major improvement on paper, I really don’t think that this translates to major gains in real robot precision. There are other sources of error in odometry that cause much greater errors than the encoder resolution. On top of that, the movements we make on the field are quite large compared to the sensor resolution, usually on the scale of inches. We usually don’t try to move 0.05" in autonomous! Having just said all that, the new rotation sensor looks much smaller than the shaft encoder, possibly making mounting easier.