On their own, these motherboards don't appear to be much different than current generation motherboards be it for AMD or Intel platforms.  You will notice that the abit and ASUS motherboards only have three memory slots - a result of the three channel memory controller on the Nehalem processor.  The other motherboards however have four slots - a mystery that I haven't quite unraveled. 

The processor socket is similar to that of the LGA775 in its design - the CPUs will remain pin-less with a ZIF-style retention configuration.  Almost all of the motherboards have four PCIe slots on it, theoretically for some serious multi-GPU action. 

Intel did have a Nehalem system on hand to prove it was working - they were demoing Assassin's Creed on it.  There were no details on the CPU frequency or anything like that, but there WAS an NVIDIA GeForce 9800 GX2 in the box...