Biostar uploaded a closeup of what appears to be an Intel Z490 chipset based motherboard. This would be the first public display of a Z490 motherboard. These boards are required for Intel's soon-to-be-released Comet Lake-S processors, which use the new LGA1200 socket. You can probably expect news at next week's CES 2020 show in Las Vegas.
The Z490 is already known to be the only board supporting Core i9-10900K at its full potential (this probably refers to 125W TDP option).