Android 3.1 has just descended onto the ASUS Eee Pad Transformer recently, via a leak, so no official software right here. The final version of the software leaked over the past weekend and it seems to work just fine, in spite of not being released by the proper authorities in the field.
This is stock Android 3.1 and it improves performance and responsiveness of the device, except the JavaScript performance, that’s actually worsened somehow. The Honeycomb 3.1 upgrade also includes a new firmware update for the Transformer dock, that fixes some bugs and adds a new power saving mode.
You can find out all the info about the installation process in the Source link below.