It seems that Nikon is working on a Z90. Will the temptations never end?!
"A scaled-down version of the highly-anticipated Z8 camera, with a smaller form factor and a 33MP APS-C/DX sensor. Firmware (under development) has up to 15fps and 4K video capabilities, making it an ideal replacement for the D500. Dual card slots will also be included, with one supporting XQD cards and the other supporting SD cards"