Info from the One piece Ten event in Japan. ( 15th anniversary of OP )
Ace's bounty now confirmed to have been 550,000,000.
Main poster for the event, drawn by Oda of course
Oda's desk, sketch of an up and coming movie character named Z.
Notice the drawing book above the one with the number 4. It has been confirmed that it says Wanokuni on it, meaning Oda has probably finished the planing for the wano country arc already.