Quebec French Documentry about HDTV says ATSC...
 

will most likely support 1080p60 as a standard by next year.

This has got to be one of the most straightforward rumors I have ever heard!

Yes, I saw it yesterday, in the "Découvertes" show at Radio-Canada. Pretty well made by the way and easilly understandable for people not involved in video technologies like us. I wasn't aware of this either. It is certainly more than a rumor, "Découvertes" team is pretty well informed usually.