Sprint says it will allow PDAnet tethering on EVO 4G, suggests it will also allow built-in Wi-Fi mobile hotspot capability in 2.2 'Froyo' update for Android | TECHNOLOGY Blog | dallasnews.com
"So I asked Crystal Davis, my official contact at Sprint, about both those issues, and it sounds like good news all around for EVO buyers:
There's a difference between tethering (which the PDAnet app provides) and Mobile Hotspot (which HTC EVO 4G provides without needing to download an app). The PDAnet app requires a connection with either a USB cable or Bluetooth, so it can only provide connectivity for one device at a time. Therefore, the app wouldn't be a solution for someone who wants connectivity for multiple devices at once. In contrast, the 3G/4G Mobile Hotspot provides WiFi connectivity, so it can support multiple devices (up to 8) at once, without a need for a USB or Bluetooth connection.
In regards to Froyo 2.2, it has not been released yet, so we can['t] make any assessments on that particular application. Sprint has always communicated to its customers that it does not block apps. We want our customers to be able to get access to what they want and enjoy a true Web experience on their mobile device, although we cannot guarantee the performance a customer will experience with third-party applications.
So it sounds like PDAnet will definitely be allowed."
Don't know how correct this is, but should add something to the conversation.