1080p 60fps DSLR?

I am surprised that there are no DSLRs from Nikon or Canon that shoot 1080p at 60fps. Sony recently came out with one, and there are a lot of lower end digital photo cameras that do so as well.

Is there a technical roadblock or are Canon and Nikon afraid of eating into the video camera market? I love shooting with DSLRs and really need to upgrade from my D90. I've been waiting to see if either company would release a DSLR with 1080p 60fps, but at this rate I may have to just bite the bullet and do without that feature.
 
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