I own some R650s & R550s with the integrated IoT functionality running unleashed. Unfortunately that functionality is not enabled on unleashed atm. As my home automation is using Zigbee I'd love to use my access points for extending my Zigbee network range. I mean they are running anyways and using power and I'd like to skip buying additional Zigbee routers for this purpose. I wouldn't need any other special IoT functionality than this. Would be awesome if you could enable that on the unleashed firmware!
For IOT supported APs we would need the additional IOT controller to manage and enable IOT radio (Zigbee, BLE) etc for functioning. This has remained same for across the board, please do let me know if any further doubt or query.