The Holic will be called the Gravity.
As for the Shadow & Sidekick moving to Android...well, it makes sense really. T-Mobile can spend their $$$ on making higher end devices (features, etc) as opposed to licensing an OS for each device they sell. Windows Mobile & the Blackberry OS will have their niche for the forseeable future when it comes to the "Professional Market" (Exchange/BES support, etc), but for the average consumer (which the Shadow and Sidekick are designed for anyways), the Android OS would probably be a better option.
....IMHO....
-TmoJeeves