Treat as "current ambition". Anyone who _depends_ on a certain location being open had best wait until it's actually open before buying the car. Tesla _is_ currently adding at a rate of over 100 per year, so it's not as if they're not working it, but progress depends on locating sites and getting everything worked out, so sometimes they are changing priorities.
According to Tesla's map, Maine should have had 2 Superchargers in _2014_, then another in 2015. It changed to 3 in 2015. And there's no sign of anything.