I bet its going to be as impressive as the new 5Dmk3 firmware...
it will recognise the 40mm f2.8
Yes, I am sure that is causing the delay. The might work on adding support for the single focul length EF40mm f/2.8 STM - on top of the already mentioned updates on page 1 here.
And, does the 7D support the new 18-135 STM?