HTC Supersonic Screen Grab Has Us SuperExcited, Confused

Heading for Sprint HTC Supersonic WiMAX handset
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Not quite sure about this one at the moment, things are a little unclear. It has been reported that an upcoming WiMAX enabled handset was on its way in the direction of Sprint.
Called the Supersonic, we’re not totally sure why T-Mobile are listed as the carrier on the top? Of course it is one thing to have a GSM phone with another carrier’s SIM. But its pretty much unheard of to go from supposed CDMA to GSM isn’t it?
Bearing in mind that T-Mobile is not even any where near being able to prep a phone beyond 3G, and this has Android 3.0 inside. Are we correct to assume that T-Mobile is just around the corner fro releasing the first handset with the 3.0.
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That codename does specifically mention HTC Supersonic, just like HTC Nexus One, so, will this be another phone offered through google.com/phone channel? We’re not usually stumped with screens like this, but this have left us with questions.