No, there will be no support for the 3600 Series. You can still run a mixed environment but your 3600 Series will have to be homed to a V9.21 controller. If you are using a centralized deployment your mobility domain can include V9.21 and V10.01 controllers ensuring transparent roaming across the mixed environment. Although it doesn't seem like it, removing support for older platforms is for the benefit of our customers, allowing us to move quicker to meet their growing needs for more bandwidth hungry applications as well as providing them more visibility and control over their network.
Sincerely,
Will