The minimum specs for Microsoft's Windows Phone 7 OS have taken a nice bump upwards and have been revealed at MIX 2011.
All current WP7 handsets are running the Qualcomm MSM8x50 Snapdragon,
the original 1GHz chip with Adreno 200 graphics, but Microsoft has
upgraded the requirement to Qualcomm's second-gen part, the MSM8x55 and
the more powerful Adreno 205 GPU.
So, your HTC Thunderbolt or Xperia Play will perfectly fit these conditions.