It looks like really it just looks like the DS OS and has two custom games... otherwise it has little to do with the DS. Mostly it's a Nintendo DS hardware skin over their game is about it.
Why do you believe this will be pulled from the iTunes store? Not saying I don't agree or disagree with you, I just don't see what is wrong with the app.
I think just the fact that the overlay look exactly like a DS it might get pulled or forced to change it's look. I don't really see a point of pay $5 for it, unless the games it includes are really great.