According to Meteor, a short manga titled Reibaishi Izuna ~the spiritual medium~ by Okano Takeshi and Makura Shou will start in the August issue of Oh SUPER JUMP. The manga will feature Haduki Izuna from the Jigoku Sensei Nube (Hell Teacher Nube) series.
According to Canned Dogs:
Senaka: Otaku Road reports that with the Japanese release of Tenjho Tenge Volume 17, Oh! Great's seinen manga, which began serialization in 1998 in Ultra Jump, will have sold over 10.7 million copies.
From Kadokawa Shoten comes a new magazine called Zoukan Ace A Assault. The 2007 Summer issue will be released on July 10th, and will carry extra chapters (side stories) of popular serializations such as Mirai Nikki, Garei, Fate/stay night and The Melancholy of Haruhi Suzumiya.
According to a Super Dash Bunko advertisement that appeared in Weekly Shounen Jump No. 32 (7/9), Katayama Kentarou (Author) and Yamamoto Yamato (Illustrator)'s light novel series Kure-nai will be adapted into a manga.
The new manga will start in the first issue Shueisha's new magazine Jump Square (11/2). A preview of the manga will appear in Akamaru Jump (on sale in August).
Also, according to the official site and this magazine scan, works by the following author will appear in the new "Supreme Quality Manga Magazine" that will replace Monthly Shonen Jump:
When Shueisha announced in February the suspension of Monthly Shonen Jump, it was also mentioned that a new magazine will be created to take Monthly Jump's place. According to Weekly Jump Readers' Journal, the new magazine will be called Jump Square (Jump SQ). The first issue will be release on November 2nd, and will follow a monthly release schedule with new issues released on the 4th of every month.
Super Jump issue 16:
Super Jump issue 17:
Source: Ultimatum Chat