maybe i'm going, but i'm not sure, it depends on a lot of things.
since i'm interested though, i have talked with a lady at the phone number provided on the site. you don't even need the Tessera, even if you live abroad: she said that's needed if you live in the region of the away team (for instance, if there is inter-bologna and you live in bologna, parma, reggio emilia...).
for those who are not familiar, italy is divided into 20 regions.
tickets for the derby should be available more or less by the end of august, but "check every know and then", she said.
she also said that: 1. there is an english version on the site for the tickets, too; 2. and she added that you can buy it, download it as a pdf and then print it and show the printed paper (along with your documents) at the stadium.