Yeah, that's what I was thinking. Amazon don't list it under their 3D Blu-Ray section, which makes it confusing.
But if it was a Red & Blue glasses dealy, they'd probably have done it for the DVD version as well. I mean, films like Coraline that are being re-released on 3D Blu-Ray had Red & Blue glasses DVD releases.
Although I'm generally pessimistic, I doubt going through the trouble to make a 3D Blu-Ray for a 49minute movie about a franchise that is obviously desperately trying to save itself will do Manga UK any favours though.