Bg on server intra or not ?

Bg on server with icecrown and lorderon or only intra server ?

And what people think about this ? i think better lauch only intraserver bg and maybe after with other server of lk no ?

I believe they've stated BGs will be cross-realm, however they are implementing a system to try to keep them fair. How this system works hasn't been shared, nor should it be, as that will lead to exploitation of it.