Details about the membership are now translated on Juve's English site. Sounds like it's open to anyone around the world. Sounds like there are some good incentives there (free autographed team photo?). If they flesh out the English site to the same extent they're planning with the Italian one, I'm in.
Sound like this is the kind of official website we've been wanting for some time. Let's hope they develop it the way other clubs do.
THE MEMBERSHIP
Juventus fans can show their loyalty to the club by choosing one of two types of membership: “Member” and “Special”.
Both will allow fans access to special offers and discounts: with the former, Juventus Member, you get a selection of free gifts (standard membership card, personal certificate, autographed Juventus team photo, fortnightly newsletter), access to the website and a personalized e-mail address. The latter, Juventus Special Member, offers the same benefits plus an even greater range of services, including special rates on seasonal and single tickets, discounted subscription rates to the monthly magazine “Hurrà Juventus", special offers in connection with Juventus Channel, access to the private area of the website, special deals by Juventus sponsors, entry into exclusive competitions and a free gilded pin, not available anywhere else.