Interesting. I imagine a lot of the big tech companies are working on their competing products to Glass - they can't let Google dominate a potential market.
It's interesting art, although I'm not sure I quite understand the point of the message. Encrypting your emails may make it stand out as being encrypted, but that doesn't mean it offers anyone a peak at your data providing the encryption is secure.
A game can fail for so many reasons, so it's a bit disappointing to not actually know why it wasn't approved. I guess if we did know it'd make for a far less interesting story (if you could even call it interesting to begin with).