Just saw some article talking about this on mmo-champion.com, seems you can invite your real ID friends to run dungeons and raids, not sure for bgs, even if they are on other realms. I'm not sure it's live on chinese servers, but still good to know.
When you log on a realm type "/join english
" to get in touch with the community members.
WoW English/Chinese glossary
(2000+ translated words) found on wow-in-chinese.jfs-web.chEnglish speakers are consolidating on the same realm for Cataclysm check this thread