A major announcement followed the airing of the last episode of Magi first season: a confirmation of a second season for fall!
The Magi official site posted the teaser with "Next 2013 Fall" and "The story moves to Magnostadt" at the end. No other details are yet to be available at this time.
Another announcement was the serialization of the "Sinbad's Adventure" spin-off manga in Weekly Shonen Sunday beginning in the May 8th issue. The prototype manga was included as bonus material with vol. 1 of the Magi home video release. The manga will be illustrated by Otera Yoshifumi while the original story will still be written by Ohtaka Shinobu, the original author of the series.
Watch the teaser for the manga, here (click top right movie).
The official site is also giving away special twitter icon file for one week after the airing of the last episode in Japan. Download it, here.