You have probably read about the upcoming Intel X99 chipset which features DDR4 support. As scheduled, the chipset, processor and supporting motherboards should be available in the period of August 2014.
Accordingly to various manufacturers we spoke to, their main focus of this show is still on the more mid range and gamers board based on the just released Intel Z97 chipset. In fact the Z97 chipset introduced some minor changes to the Z87 with add on features like SATA Express and M2.
Thus, we might not see even static display of the motherboard at the booths or VIP rooms.