As of March, 2016 you can watch this movie on iTunes in 75 countries and on Vimeo on Demand (https://vimeo.com/ondemand/asortofhomecoming) in every country outside of the US or Canada.
In the US, there are theatrical screenings in select cities through Tugg.com (https://www.tugg.com/titles/a-sort-of-homecoming).
MarVista Entertainment will release the film on video on demand in the US & Canada in the late spring of 2016.