Yup, in the US it's showing in select theaters only on Tues., May 16. And I agree that the primary audience is probably people who've already seen it, or have already been planning/dreaming about their camino(s), or are remembering their own past camino(s).
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon