To help ease the transition Blizzard will be providing a glossary of common English and Spanish terms used in battleground PvP so newly interacting players can overcome the language barrier. Now if anyone gets on you about rotting your brain playing video games, just tell them you're practicing your foreign language skills!
For the time being, Blizzard is also opening up the local-language only forum restriction for the Spanish realms affected. If you wish to team up with Spanish players but don't really speak Spanish, now's your chance to ask them in English and hope that nothing gets lost in translation. Happy bilingual battling!
The full blue post after the break.