Just looking through the website (unfortunately I don't have an iOS device on hand), you've got some killer features here that I've wanted for a long time.
'clippings' looks really excellent. I would go so far as to say this is a game-changer for me as it currently stands. If you took the same idea and went bigger, that would be awesome: I'm thinking an e-book reader. That is, load up a Japanese ePub and then have one-click access to a context-aware J->E dictionary lookup via your app. Then being able to generate cards from the book would be perfect.
If I had to pick a missing feature (again just going from the description) it would be audiovisual context. This has been crucial to my learning - any plans to integrate it?
Finally, I don't know if you're aware but there is precedent for 'clippings' in the tools that generate Anki apps from movie subtitles. They create cards that have a still from the movie, the audio clip, and the subtitles in Japanese and English. Yours is more universal, but I think something that combined features of both would be even more powerful (i.e. audio and images).