Supplement Essays: Do the prompts change every year? When are they released?

I’m a HS junior planning on applying to Dartmouth ED this fall. The Common App prompts for this year have already been released, but what about supplement essays? Dartmouth’s supplement essay prompts for the 2014-15 admission cycle are obviously released, will the same prompts be used this fall? If not, when are they released? I would appreciate any information regarding the supplement essays.
Thanks!

My son and went on a tour last month. The director of admissions said the prompts would be out in June.