HTC has officially released the Android 2.2 update for Legend. Update is rolling out as we are writing this post, and your phone will receive a notification of FOTA update.
After installing the update, you can confirm a successful update by confirming the Build number (From the Home Screen go to MENU> Settings> About Phone> Software Information> Build number). The new Build number after the update will be 3.15.720.3.
The new update brings FroYo and updated HTC Sense. Back up your data before upgrading your phone. Do share your experiences with us after update.