Intel's SoCs were front and centers at IDF 2013 including the new Bay Trail Atom processor chip designed for tablets and ultrabooks, now called 2-in-1's. Windows 8.1 is running on the 2-in-1 platforms so this looks like the second time around with a modified UI and lower power, longer battery life devices. It is what everyone was expecting but there was working hardware on display.
Haswell SoC-based embedded boards were on display in the technology showcase. These are ones developers can take advantage of now.