It's OK to make contact with them now if you want, just realize that they are busy with the 2015 class right now.
I am aware of candidates in my district who are in the 2016 class, 2018 class and even an 8th grader.
I touch base with them and give them my contact info so they know who to contact with questions.
I also keep them updated on news, when Admissions meetings are, All-Academy Day, etc.