If everything goes well, they (Adm. Allen) announced they would be leaving the cap in place. Only if things go wrong will they reopen the seals. Even if they need to reopen it, the plan is to capture the oil into ships using pipes connected to this new cap.

Edit: I can't remember the source for this; I believe I heard it on the Diane Rehm show yesterday. If I can find the source I'll update.