If we take the comments from Clearwire's CEO at face value and extremely literally, then we could conclude that any LTE device that has a WiFi antenna and a chipset and modem that support TD-LTE could be modified to run on Clearwire's TD-LTE network. I would love to hear more info on it though. Because as of today, the only place I've seen anyone say that is the quote referenced in this thread.
On another note, we have seen lots of things from Sprint and Clearwire relating to TD-LTE, but I have yet to see anything that confirms the concept of going back and getting existing LTE devices an update to run on the 2500 TD-LTE network. But I am intrigued at the thought.
I don't think it is a big deal to resubmit it to the FCC for testing of the new frequencies. But in the case of the EVO LTE, if there was a way to modify the device with an OTA to make it run Clearwire TD-LTE, then they would have to get it tested through the FCC before pushing that OTA.
Robert