A member of
the Xtreme Systems forum has posted a fair amount of details on Asus's upcoming Striker II series of motherboards which include at least two models, one based on the 790i and one on the 790i Ultra chipset from Nvidia.
The model names are Striker II Extreme for the Ultra board and Striker II NSE for the non-Ultra model. There shouldn't be any physical differences between the two boards, at least not based on the information posted.
However, going with the 790i Ultra version adds support for DDR3 1,600, 1,800 and 2,000MHz memory, while the non-Ultra version is limited to DDR3 1,600MHz.
There's no actual picture of the board, but there's a component diagram and loads of details on the specific features of the boards. Expect to see support for the latest CPU's from Intel, four memory slots, three PCIe x16 slots, although only two of them are PCIe 2.0, two PCIe x1 slots of which one is intended for the audio riser card, and two PCI slots.
Other features include eSATA, FireWire, six onboard SATA connectors, dual Gigabit Ethernet and support for up to 10 USB 2.0 ports.
You can find the forum post here