(in Japanese)
Btw, the previous secret unmarked button is just the lock button. :-(
Saturday, August 01, 2020
Dimensions and Wireless+Power Info of the K-New
https://twitter.com/nokishita_c/status/1289117575759032320
Wi-Fi(11b/g/n) with Bluetooth; Dimensions: 134.5mm W x 103.5mm H x 73.5mm D without protruding parts (138.5mm W x 103.6mm H x 80.4mm D maximum), i.e., a little bit larger than the K-3/II but with less depth; Power: D-LI90 with optional vertical grip D-BG8.