Birtday Hub 2.1 is published to the Windows Phone Marketplace. It has some minor fixes and a better Live Tile.
At the bottom are some new screenshots.
The left screenshot does show the new anniversary edit page. In the field with the caption Name you can enter any name with the on screen keybord, which has not be in the People Hub or you can select a contact from the People Hub by pressing the + right of the Name edit field. It will show all your contacts with a phone number. If there are more than one phone numbers at the selected contact you can select one that should used in any case for one of the phone fields. The other phone field will be filled automatically. After you have selected a contact you can edit all of the fields if you want.