We've already reported on a number of motherboards that are ready for the upcoming Intel 4th generation processors. The motherboards in question are the B85M-D3H, the Z87-D3HP, and the Z87-UD3H. All three motherboards are value-oriented boards.
The B85M-D3H is the smallest of the lot. It is a simple Micro-ATX board, with a simple 4-phase power delivery VRM design, four DDR3 DIMM slots, one PCIe x16 3.0 slot, a PCIe x4 2.0 slot (disguised as an x16 slot), and two legacy PCI ports. Moreover, the board features four SATA3 ports and two SATA2 ports, as well as a total of four USB 3.0 ports, two of which are on the rear I/O. Other rear I/O connectivity is handled by a DVI port, an HDMI port, a VGA port, Gigabit Ethernet, a handful of USB 2.0 ports and 7.1 HD analog audio.
In all likeliness the Z87-D3HP is the cheapest board. It features the same 4-phase VRM design, expansion slots (plus two PCIe 2.0 x1 slots), and memory DIMM banks. External connectivity is taken care of by a DVI port, HDMI port, VGA port, six USB 3.0 ports, 7.1 channel HD analog audio jacks, optical TOSLINK, and Gigabit Ethernet.
The Z87-UD3H board is a bit closer to the mainstream segment. It features an 8-phase VRM design, four DIMM slots, two PCIe 3.0 x16 slots, a PCIe 2.0 x4 slot disguised as an x16 slot, and three PCIe 2.0 x1 slots. SATA connectivity is taken care of by eight SATA3 ports. External connectivity is managed through a DVI port, an HDMI port, a VGA port, six USB 3.0 ports, Gigabit Ethernet, channel HD analog audio jacks, optical TOSLINK, two eSATA ports and Gigabit Ethernet.
Most likely, we'll be seeing more official details soon at Computex 2013.