About a 4th season of Got

Charles has accidentally let slip that there will be a fourth season of Game Of Thrones.
‘We’re about to start season four aren’t we? This year.
‘We get scripts pretty early on, much earlier on than in similar series, usually you get perhaps one episode and you just have to trust that what’s going to come in subsequent episodes is going to be as good as the one you’ve got, but in this I think there are six scripts already written, and we will probably be able to see them with more than adequate time to prepare before we start shooting.’