Board Thread:Spoilers!/@comment-1916997-20150313202428/@comment-7345267-20150501182154

Usually, a "concept movie" is a rumored but unconfirmed movie.

I think what they're going for in actually is that the finale is "high concept" and was written more like a movie (it's a two parter, after all). "high concept" means that the premise and direction is, lacking a better word, obvious.

Most of OUaT is "low concept" - the themes are a bit deeper and complex, and character development is at the forefront. Since they also say the finale is structured differently, I'm inclined to believe that it's more high concept than they've done before.

Here's the Wikipedia article on "high concept" if anyone wants to read further.