Upton's skill set is similar to his brother's, BJ. He has five-tool potential. He is currently playing shortstop, but there is a pretty good chance that he will move to CF when drafted.
Stephen Drew (JD's brother) was Arizona's first round choice from last year, but has yet to sign. Drew is a shortstop like Upton currently is. Even if they do happen to sign him, I don't think that would decrease the odds of Arizona taking Upton, because, as stated earlier, he could move to center.