Coro Coro announces contents of July's issue
The following text has recently been added to Coro Coro's website with information on the next issue:
Literally, it translates to "A treasure trove of Diamond and Pearl news! Packages, characters, Pokemon battles, new art and the like, early stage screen-captures. All this is determined!!"
As the boxart of Ruby and Sapphire revealed Groudon and Kyogre to the world, it is highly likely that two new legendary Pokémon will also be revealed in this issue.
Bulbanews will have all the information as it is received.