The WDK ISO download link has been moved off of WHDC
For those of you who are trying to find the WDK download link on WHDC, it is not longer there. It has moved to the Microsoft Connect site. Peter Wieland previously described how to get the WDK Beta 2 ISO from this site and nearly the same instructions apply, you can read them here. The 2 changes to the instructions are that there is no longer a survey (step 4) and the link's name is "Windows Driver Kit RTM" (instead of "WDK Beta 2"). The big gotcha for me was finding the download link (step 5), which is nicely "hidden" on the left hand side of the page. Hopefully you can find it faster than I did ;).