I am trying to figure out why they mount the 400 2.8 IS II on this camera. If I am going to mount a lens with that size, it will be a proper DSLR. Thinking more about it, while able to mount EF lens sounds great, but in reality, it just doesn't seems practical. The balance between the body and EF lens will be awkward without using a tripod/monopod, which really defeat the purpose. The battery only last 230 shots is off putting also. I guess that is the price to pay for camera without viewfinder and relies on LCD screen to do most of the functions.
Originally, I was thinking it maybe good to use it as a backup body for people already has a collection of EF lenses, but now I think T4i is the better option.