This makes sense to me. If the iPad Mini and iPods are going to be Apple's stronger Christmas products every year, they could make some breathing room by moving the big iPad and the iPhone back to a Summer release.
A summer release for the full sized iPad is far enough past christmas that people won't hold back on buying one, which I think the March schedule sort of lead to. I also doubt that Apple intends for the fairly minor 4th gen iPad revision to last for a whole 12 months. It seems obvious to me that they would move the full sized iPad to the iPad Mini's body style (thinner, flat back) if they could, but they're waiting on the IGZO screen tech to make it happen.
The time of year that they release the phone really doesn't matter because most people buy phones on a 2 year cycle dependent on their contract.
I don't know that Digitimes' report is at all accurate here, but it does make sense, which is better than most stuff from Digitimes.