Well the 40D’s were very impressive, so much so that I still have one today. I may sell it off someday but it is still doing what I want it for so I am happy to keep it around.
When Canon came out with the 50D I was not happy, nothing that I saw said this is worth upgrading to. When they came out with the 60D I was sad as it was in my opinion a step backwards. So I stuck with the 40D’s. Then Canon brought out the 70D and I could not help but switch. There were so many updates that I was VERY happy. Sold all the 40D’s but one. Bought a bunch of 70D’s and was very happy.
AS I type this I am surrounded my 70D’s. One is dedicated to my 150-600 lens and does a great job. They all have the extended grip and dual batteries. I can say that at this time I do not see an update happening with what is on the market.