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Aleast now we know it will have a simulcast.
http://www.animenewsnetwork.com/news/2015-12-18/funimation-to-stream-one-piece-~adventure-in-nebulandia~-anime-special/.96699
does that mean it will be subbed while broadcasting
No, it will be already sub when they put it up on the site. It will be like they usually do with the tv series episodes.