I just connected my HD7 (TMOUS) to Zune and got the update notice.
I hope is this http://wmpoweruser.com/htc-update-for-mozart-and-hd7-available-enables-internet-sharing/
Installing right now
I hope is this http://wmpoweruser.com/htc-update-for-mozart-and-hd7-available-enables-internet-sharing/
Installing right now