Wouldn't be surprised if the did a 5.5 right before the playoffs.
IIRC the new models don't leak halfway through a season, usually in the off season.
I went to my local FL the other day and they had all the Kyrie 5's on shelf, bar the concepts/tacos. I didn't try them on, but felt the sole with my hands across all models like a damn perv sampling the goodies.
There was quite a discrepancy between all models, some felt slippery, some felt like they had more friction. Funnily enough, the Rokits, despite being translucent had the best feel.
Again not the most reliable test. Even then a specific model i.e. Black Magics could have varying traction themselves as opposed to other models.