LOL Wow that thing looks huge.
Anyway, that extra analog is to play the Monster Hunter game that Capcom is making for the 3DS. I dunno what other games will make use of it. I have no need of it with the games I've played on the 3DS up to now.
I think Nintendo could very well release a 3DSXL with the extra analog already built-in sometime in the near future. But if they are planing to do that, I think they could save a lot of face by making it possible to exchange your original 3DS for the new one.
But whatever... I'm happy with my 3DS. Won't get the vapors just because it might get updated eventually... I think we all knew it would happen. Maybe not this soon, though