B2W2 Gym Leaders confirmed
The Gym Leaders will be Cheren, Homika, Drayden, Clay, Elesa, Skyla, Burgh, and Shizui (order, other than the first two, is currently unknown). All Gym Leaders from Pokémon Black and White except Elesa use their original artwork.
The guidebook itself is set for a June 30 release, and will retail for ¥680.
Update: An image from the inside of the guidebook shows a modified type-effectiveness chart in B2W2. According to the chart provided by the guidebook, Ghost-type Pokémon are no longer resistant to Bug-type moves. Note that this could simply be an error in the guidebook itself.