Update today from Editor Kawasaki of the Famitsu Bunko (SFW article, NSFW site):
It's time to introduce the
Idiots, Haruhi, and a Collaboration Fair specialties. Here are the posters that'll be hung up to advertise the fair:
The Haruhi characters are drawn by Haga and the
BakaTest characters are drawn by Ito.
Whenever you purchase one of the items in the fair at a participating store, you'll get a coaster:
(prototypes)
I mentioned volume 11 earlier, but the first three
Haruhi novels will have new obis with the Haga cover art:
Unfortunately, the same cannot be said for the
BakaTest novels. Here's what their obis will look like:
Those who send off to participate in a lottery also win tapesties (combined,
Haruhi,
BakaTest) or a pre-paid book card (Haruhi/Mizuki).
Lastly, those who purchase any of the fair items at Gamers, Tora no Ana, or Melon books will get a special newly written story from Kanji Inoue called
Idiots, Tests, and Summoned Beasts: Melancholy Vol. with cover art from Noizi Ito:
There's only a set amount of these booklets made, so when they're out, they're out.