Was not expecting to hear news of a 4th installment. I've just gotten use to the idea of expecting Trilogies. So, this makes me think that if the next 3 are successful financially and there is no indication they won't be, Quadrilogy may become the new 'Trilogy" in the future. Don't laugh, if Studio's have it their way, they will want to market all of their Tent-pole franchises as such.