1: Isn't that already in the actual game?
2: That's really a feature of Black/White?
3: You're asking whether Nintendo will make an update to allow flashcards to play DSI enhanced games/parts?
4: They won't. And you'll have to take that up with your flashcard/firmware makers.
5: Those features are almost always pointless. And I say almost because I haven't extensively checked. I'm close to just 'always.'