Interesting rumour. It's hard to believe that canon will come out with a 70d before a 7dmk2 as the 7d is older than the 60d...Thats the nature of consumer v pro level cameras. The Ti cameras get updated yearly. The xxD cameras get updated about every 2 years. Anything in the xD level usually takes more like 3 years.
Also, if releasing a new 7D at $2000+ has the same effect as the 5DIII did on the 5DII (lowering the price 20%), than nobody would buy a 60D. They'd end up with the 7D costing the same as a 60D, and nobody in their right mind would turn down AFMA, 8fps v 5fps, weather sealing, etc for a swivel screen. Also, the T4i is getting the 60D's autofocus, so again, fewer reasons to buy the 60D. It's why it will probably get upgraded first.