Details about what’s in the CoroCoro magazine have been posted on Twitter, although no scans are there to back them up. The poster claims that Tornadus, Thundurus and Landorus change formes with the use of an item, while Keldeo changes to its Resolution Forme by taking it to Sangi Town’s forest.
Finally, PokéTransfer is still there, allowing you to transfer Pokémon from Gen IV games to B2/W2 as Nintendo of Greece reports.