remember folks..... we are talking about a FF camera with the same pixel size as the 7D2. It will have very similar IQ to the 7D2. It will have very similar ISO performance to the 7D2.
You can't have the megapixel count of tiny pixels and the performance of large pixels. You can have one or the other... or a compromise. You can't have both. The 6D, 5D3, and 1DX will be superior in low light.
That's why I think it will be a new series, not an update of an existing series.
I bough the 6D to be a low light camera. I do not care if it has the ISO performance of the 7D II. I want a very weak to non-existent AA filter High MP camera for landscape. I would like an articulating screen because I to most Landscape on a tripod in live view. It is very helpful be able to adjust the. screen to a better viewing angle.
Yes tiny pixels = miserable ISO performance.
I really do not see them replacing the 5D III for 2 more years. As an event camera what is wrong with the 5D III? I really do not see anything.
The 5D3 has to be about the best general purpose FF camera out there.... I can't see Canon messing around with it.... I really doubt that a new high megapixel camera would be a 5D4