Your right that Sprint has yet to say anything but all rumors out there is information. Just how you believe/take it is the problem. You can take this info and wait till the 7th to see if Sprint announces it.
According to the link i posted before you don't need to change the radio for the first phase of Rev B. From what they are showing you can update with just software. I also saw a post that they can update to LTE with the Wimax radio with just software, so who knows. If the rumors are true and they do upgrade to Rev B and its just a software update for us to use it then all will be well... its specs show about 9 mbs on 3g.
I'm not saying any of this is true or fact , just information out there that we can read to better understand the technology. This is how I take it and hopefully Sprint will deliver some good stuff next month. but if not I'm sticking with them anyway.