One role the 70D will fill is paired with the EF 24-105mm f/4L lens as a companion to the full frame 5D Mark III paired with the EF 17-40mm f/4L lens. The 24-105mm lens has an equivalent field of view of 38.4-168mm on the crop sensor 70D. A 10X zoom range with the two bodies and high quality lenses will be great for outdoor events and travel.
On my walk through Cohoes and Waterford this morning I carried the 70D and 24-105mm lens. The first two photos were made from the same spot and show the minimum and maximum focal lengths.