Board Thread:General Discussion/@comment-4479676-20161215073504/@comment-27020644-20170102214921

There might be another Thor/Guardians of the Galaxy connection besides Sakaar and the Sakaarans. Guardians of the Galaxy introduced the Celestials in the MCU. A behind the scenes photo of Thor:Ragnarok was posted which featured the director wearing a Celestial mask, suggesting that one of them will appear in the movie.

So, this may also be a build up for the Thanos versus Cosmic Entities battle which took place in the Infinity Gauntlet storyline. Among other Cosmic Entities, Thanos fought multiple Celestials.