Ok, so we know Windows is going to push Phone 7 and looks like RadioShack is on board pushing the Samsung Focus, HTC, HD7 and the LG Quantum.  The Samsung and the LG are running AT&T while the HTC is running T-Mobile.  Its far to early to know about rooting the phone to swap cards out, but I expect that will not take too long.

The Shack® is introducing three new phones featuring Windows Phone 7:

• Samsung Focus™ from AT&T, available now in stores or via Direct2U, boasts a brilliant 4-inch Super-AMOLED touch screen, a 5-megapixel camera and 8GB of storage for $199.99 (qualifying new or upgrading customers, with two-year contract).
• HTC HD7™ from T-Mobile, now available in stores or via Direct2U, is available for $199.99 for qualifying new customers with two-year contract or $249.99 for qualifying upgrade customers with contract. The HD7 offers blockbuster entertainment possibilities with a 4.3-inch high-resolution screen and kickstand. HD7 is built for streaming video, mobile gaming and its integrated 720p camcorder means you’re also equipped to produce home-made HD videos.
• LG Quantum™, coming soon from AT&T for $179.99 for qualifying new or upgrading customers with two-year contract. LG Quantum features a sliding screen with a horizontal QWERTY keyboard, 3.5-inch screen, 1-GHz Snapdragon processor and 16GB internal memory. LG Quantum also enables wireless multimedia sharing with other devices. See radioshack.com for updates on in-store arrival.