Without the contributions of the Irish, we would have no color green in videogames. Without green, we would have no Luigi. You all should be so grateful to have Luigi in your lives, which is why he has kicked Mario off the front page of Club Nintendo and replaced the logo with something a little more festive.
In addition to claiming what has always been rightfully his, he's also made available a new reward item. The Nintendo 3DS Pouch: Luigi Edition is exactly like the original Mario one, only a billion times better. Who knows how limited this 7.5" x 5.25" case is, but if you want to snatch one up, be prepared to part with 450 hard-earned coins.