To be more specific -- and much less acronymic -- it appears that the super speedy Xbox 360 802.11n Wi-Fi adapter has been spotted on a promotional flier inside the Italian version of the Gears of War 2 Game of the Year edition. Italian gaming site Mondobox.com (translation) posted an image of the leaflet, which you can see above. Assuming it's authentic, it seems to indicate that both the original 802.11a/b/g and 802.11n adapter will continue to exist in the same market. And that, hopefully, indicates a price drop on the ridiculously overpriced original adapter.
We've contacted Microsoft about the peripheral and will update this post with new information if and when we receive it.