I don’t think the translation is the amazing part – as one of the creators said here, at the moment it mostly does word-for-word translation. Google’s statistic

I don’t think the translation is the amazing part – as one of the creators said here, at the moment it mostly does word-for-word translation. Google’s statistical machine translation is mightily impressive technology, I’m not sure whether you could even theoretically put it on a phone at the moment. You would ideally want the OCR and text replacement together with Google’s translation algorithms, which, besides requiring a network connection at the moment, would also introduce way too much lag that would kill the experience. (Word-for-word translation is a perfect compromise in the meantime.)