The BBFC also has information about
http://www.bbfc.co.uk/AVV276403.
However, the fact that the packaging doesn't mention it is a big turn-away. First, there's the fact that the 3D version is exclusive to Samsung. If the Button of Doom short ends up an exclusive to a store on DVD only (a la 'Boneknapper' with HTTYD only in ASDA On DVD), then I'm unlikely to be in a rush to get this movie.
..Of course, the packaging could still have yet to be confirmed, but you never know.