because people do not want to piss off Canon and still give an honest assessment.
This camera has been out for a month and if you search the youtube postings of various video you will see plenty of footage has been shot with many sorry attempts at tracking moving objects and babies with the autofocus. The Autofocus feature focuses only slightly better than a drunk with blood alcholol of 1.0 and it leads one to wonder if the only news is bad news then the silence has to be interpreted as not wanting to give bad news for fear of Canon blacklisting. What else could it be?