Personally I'm really interested because with this, the day comes ever closer that I could pug any raid with any friend I have of the same faction. It's a change I never expected to see, and one I'm very interested in watching. If this eventually leads to, say, one North American virtual realm for all players, I might be okay with that.
But enough about me. This is about you. What do you think? Let us know, we're keen to hear it. Patch 5.4 definitely isn't afraid to shake up the status quo so far.