Computex 2017 - ASRock delivered the only X99 motherboard to the consumer market and it seems that they have done it again with the X299 chipset. The socket will support LGA2011 mounting.
The X299E-ITX/AC features the new chipset along with four SO-DIMMs, which ASRock claims can support up to 4800MHz DDR4, as well as quad-channel memory support. While it only has a single PCI-E x16 slot like most other mini-ITX motherboards, it does offer two x4 PCI-E 3.0 M.2 slots. Two of them are located on the back of the motherboard, while the third is located on a daughterboard behind the IO panel.
The motherboard actually features a second daughterboard that allow ASRock to cram more into the mini-ITX form factor including six SATA6Gb/s ports and a USB 3.0 internal header. The SATA/USB board sits above the VRM heat sink, which looks like it is small enough to cool down high quality dual N-channel MOSFETs or fully integrated power stages.