One of the downfalls of adopting a puppy, of any breed, is that their genetics are unknown... and a puppy isn't exactly going to show signs of what their future genetic temperament is like.

However, I tend to believe that nurture, for the most part, is much more important than nature. As far as being prepared for aggression... that should not be an issue, given that you socialize your puppy from day one with other, polite dogs and puppies and hundreds & hundreds of people of all ages/sizes/genders/colors/clothing styles/etc! Pit Bulls are prone to dog aggression, but the chances of that will be greatly lessened by raising your puppy with other stable dogs. Do you own any other dogs? If anything, my only warning would be to prepare for a crate & rotate or seperate situation if, in the worst case scenario, the pup does turn out to be dog aggressive. Even if dog aggression does arise, lots of conditioning, desensitizing, and solid Obedience training can make that easily manageable. That's a big IF! Plenty of Pitties are very dog friendly, and if not, most are good with other dogs in the family. Both Boxers and Pitties are supposed to be super human friendly.

Sign up for positive reinforcement based puppy classes NOW! Get into as many puppy play groups as you possibly can! Annoy all of your friends to socialize the puppy with, and call up everyone you know/ask neighbors who have friendly dogs for playdates. The biggest socialization window in a dog's life is between 8-16 weeks!