Don't forget, Zephray, that what we will be calling season seven is among the episodes that was part of the leaked announcement. That film Z has been confirmed and it, too, was one of the properties listed as part of that same leaked announcement. I see no reason to think that Impel Down has not already been long ago acquired. Personally, I would surprised if they haven't entered into negotiations for Marineford yet.
Whether or not they have actually started dubbing is another question, but I really don't see why they couldn't have at least started by now. How quickly they really release season six could be an indicator to that. Season six's delay, I think, was the exception and not the rule.
what leaked announcement you referring too