So in your confusion you do not understand that the only current production models are the 1D X, 5D III, 7D (again differ5ent price points / markets), 60D, T4i / 650D and T3/ 1100D; the rest are onsolete / out of production just like a 1964 MustangWell, according to the dealer logs, the T2i, T3i, and 5dII are not out of production/discontinued. While you are correct that there are newer models, Canon keeps some old models in production, and as such you'd have to consider them part of their active line.
The T4i clarifies the Rebel line some...the T2i/T3i being active at the same time definitely confused the hell out of a lot of people. Most of their other products differentiate from each other enough to not cause that same confusion. I think a 70D that returns to its 50D like form could create confusion with the 7D (since they'd likely be pretty similar).