Jonathan 'Wolf' Rentzsch with some important information on mogenerator and the App Store. Looks like Apple have used mogenerator in a private framework and as a result warnings are being flagged due to mogenerator selectors being included in their list of private APIs. I am a little more hopeful than Jonathan that an exception will be made for this but he does have a (fairly hilarious) potential solution if that doesn't happen.
Update: Changed "rejections" to "warnings" above. I was wrong in saying rejections were happening from this. See this thread for details.
Update 2: Seems like this might be fixed, see the details at the bottom of the original post.