Sony Mobile Japan has announced that the Xperia X Performance (SOV33) will land on au by KDDI in mid-June 2016. This is slightly ahead of the western release, where it is expected to arrive in early July.
The handset has broadly the same specifications as the global model with 32GB internal storage (the 64GB variant will only arrive in the dual-SIM models). The one difference that we spotted in this model vs. the global model is a lower battery capacity (2570mAh vs 2700mAh). However, given how long ago the Xperia X Performance was announced, we hope there has not been a revision down in battery specs of the global model too.