Some people on this forum appear to be surprised or even upset that others are disappointed the R3 looks like a 24mp camera. However, it is basic psychology, which manufacturers try to exploit. Everyone who is in the market for a new camera has an ideal product in mind. When Canon made the development announcement and dropped in their teasers, people latched onto the vague specs that fitted their ideal. Unfortunately, as vague specs harden up they will no longer match the ideal for some people, so they will be disappointed. (And, I am very happy for the people whose ideal these specs match.)
I am currently in the market for a new camera and am disappointed at the rumour. I stuck with film until DSLR technology offered a compelling advantage. For me, that was the 40D (at the time good resolution, AF, speed and price). I kept that for 8 years until I upgraded to the 7D MkII (another compelling advantage). I think moving to mirrorless will now be another compelling upgrade, so I am looking around. The grips never came off the 40D or 7D and having briefly borrowed (and loved – apart from the weight) a 1D camera, I hoped that might be my future. But lack of pixel density would be a problem for me, which weighed against it. I loved the 600mm/F4 I borrowed, but I could not justify the cost, as it would be frequently left at home as it is too heavy, so I’ll stick with a 100-400mm (or 100-500mm or 800/f11). Then the R3 announcement turned up with the potential to be ideal, which made me very excited
Integrated grip, superb ergonomics, improved AF, improved (BSI) sensor, better battery=faster focussing etc. I shall wait for the confirmation and then start dreaming of the next ideal, an R7 (same body style as R3, but with crop 30mp+ sensor) or R1 (same body style as R3, but with FF 60mp+ sensor) and hope I can afford them if they appear. Meanwhile, I can still (and probably will this holiday season) buy an R5. (I know, I could switch to Nikon or Sony or ..., but in the 40 years I have owned [D]SLR cameras, Canon has consistently offered the best overall system even if they have not always offered the best camera. My purchases have a very long term outlook.)