There is an early indication that KP.2 is causing trouble in the UK. Here is positivity over the pandemic using PCR for the area.

The US is just slightly behind the UK in the rise of dominance of it.

As a general thumb rule, I’ve noticed that hospitalizations tend to start rising rapidly when a variant reaches about the 40% mark of all variants in a country, so it will be interesting to watch what happens when the UK crosses that threshold. Currently the downward trend in COVID hospitalizations seems to have hit a plateau, suggesting that this estimate may prove to be correct again.