According to the Shounen Sunday official website, next issue of the magazine (out July 18th) will feature a special conversation between Takahashi Rumiko (author of Ranma 1/2, Inuyasha and the current Kyoukai no Rinne) and Arakawa - both big fans of each other’s works. In the interview the mangakas will discuss multiple subjets, such as manga and food, plus collaborate on some illustrations.
To celebrate the release of volume 4 of Silver Spoon (out on the same day), Shounen Sunday will also feature the series on its cover and include color pages.
And finally! The series has now its own separate official site and official blog, which also announces a series of 20 different TVCM videos (such as this one) shot in an actual Hokkaido agriculture high school.