MSI uploaded BIOS version 7B58v151 beta for its Z370 Gaming M5 motherboard. What makes this update interesting is that the changelog reveals it adds "support for new generation CPU." No further details were shared, and MSI doesn't recommend updating to this beta version unless it is necessary.
Presumably, the update adds support for at least some of the upcoming 9000 series CPUs from Intel:
Intel has already leaked their upcoming 9000 series of processors, which offers up to six processing cores with their i5 series branding, lacking any i7 listings under the code name "Coffee Lake (6+2)" with the six identifying core count while the 2 signifies the unit's number of graphical processing units.