I'm pretty sure you can merge multiple accounts on the same bnet into one as a blizzard service, but I don't think you can do any of the normal account services (name change, transfer, etc...) yet.
They said they won't offer services that weren't originally available in vanilla.
Correct me if I'm wrong, but I don't believe you could transfer characters to other accounts in vanilla. Only realm transfers and name changes - both of which had some pretty severe limitations along with them.