I just updated to 13.10 from 12.10. On restarting, I was completely unable to use my keyboard or mouse through USB. I have no PS/2 devices to use. Also, it said that I had been disconnected from my network even though I did not do anything to disconnect it myself. My network card is connected through PCIe x1.
The USB worked in 12.10 and 12.04 and also works in the BIOS and before loading into the kernel, working when you hold shift to test RAM or go into recovery mode.
The kernel is by default 3.11.0-18. Reverting to 3.11.0-15 gives the same issue. Booting into either recovery modes lets you load up the kernel but when the menu appears to start dpkg or other options such as networking the keyboard again fails to work.
Tested with Tesoro Durandal G1NL, Cooler Master Storm Spawn, and a Dell keyboard and Targus mouse of which I am unsure of the exact models, although they were not recently made.
Also of note is that it is not simply a problem with not being able to move the cursor. There is no cursor at all. Ubuntu boots into a black screen, on which a cursor appears. The cursor flickers and then disappears. It then boots into the Unity desktop, with no cursor.