Board Thread:Naruto: The Last Discussion/@comment-12509038-20141206031744/@comment-945885-20141207035327

Given enough sources, I think it's suitably verifiable. The databook itself is obviously credible, and I think there have been enough summaries of the movie to confirm the entire plot, or at least the broader strokes.

Of course, there's no harm in waiting a bit longer. I'd maybe wait for a summary to hit the Japanese wikipedia.