I remember how hard that game was. My whole family played it toghether and we used over 100 hours in total I believe, on 1 playthrough.
I'll never have a gaming experience quite like it again (which is kinda odd, the most fun I had with a video game was when I was 5...)
I don't think Nintendo will do anything though. And I'm not sure I'd like them to do anything big like announce a game. If they do that, I'd rather have them do it at a conference so they can show things and stuff.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS