Do a lot of prompts change year to year on Common App?

I read somewhere that the basic questions on Common App change every two years, with next summer being a new set. IS this true? What about the individual school prompts… it it a good idea to preprinted essays before the August Common App comes out? (And for those who don’t know, if you begin Common App prior to August 2017 for the 17-18 cycle, know that not all the information “wraps” into the new year’s application.