ASUS ROG MAXIMUS XII will feature the four models pictured below (ROG Maximus XII Formula, ROG Maximus XII Extreme, ROG Maximus XII Hero (Wi-Fi) and ROG Maximus XII Apex) as well as a (presumably white) Extreme Glacial All versions have 16-phase power stage design and support DDR4-4800 OC, here's a bit more about the ROG Maximus XII features:
The datasheet clearly confirms that the Z490 ASUS motherboards have PCI-Express 3.0, not 4.0, although some rumors indicate that Z490 motherboards already have 4.0 support, but only for the Rocket Lake-S series.
All motherboards except Hero have 2.5 Gbe network card. Formula and Extreme also have 10Gbe networking. The ROG Maximus XII Extreme is the only E-ATX motherboard from the ROG series.