I have always been a subscriber to "drive it like you want it to run". I ran a BMW (and whipped his @$$) with less than 20 miles on the clock. The motor itself has already passed a test before Ford dropped it into the truck. The rings need to seat as part of the break in. The biggest enemy is long times at the same speed.
A lot of these newer motors don't seem to need a break in period, makes it a lot easier. For example, the Evinrude E-tec doesn't need a break in period at all an those are marine engines subject to continuous high rpm and a lot more movement and pounding. first season put 400 hrs on, now after 7 years she has almost 2,000 hrs and is still running strong and debendable. But as said ^ always a good idea to ease it into use.
The 2012 owners manual says try not to drive at a constant RPM/speed for the first 1k, don't tow for the first 1k, and don't exceed 70 mph or make full throttle starts for the first 500 miles that you do tow.
i asked the service manager about this when i bought my '12, he said just don't use the cruise control for the 1,000 mile break in period. i asked him about towing and he said i can tow with it right away and it wouldn't void the warranty. i did about 2 hours of towing with it after 300 miles with my bass boat, just cause i really wanted to go fishing...
I am waiting for my pickup as well, sounds like first of next month, we are planning on going camping on memorial day weekend. I hope to get at least 800 miles on it before we tow. Maybe a road trip for a weekend to get it ready. But I'll just take it nice and easy towing for the first time.