I wouldn't be surprised if we don't know when and where in the US the 2016 World Yo-Yo contest will take place until close to this year's contest.
But, although I expect the 2016 World Spintop Contest to be held together with the yo-yo contest, that is not a certainty.
First, we need to be invited to join. If the only non-Japanese competitors in Tokyo are Val and me, for example, they may think there is not enough interest by players. And the venue might have less time available than at the Rosen hotel to accommodate us (the Mall of the America in Bloomington, MN, was mentioned as an option at one time if Greg did not organize it).
Secondly, the decision of where the spintop contest will take place will be decided by the International Board of the ITSA. It could take place with the Miamisburg or Kansas City festivals. It might not even be in the US. It could be in Mexico or Colombia. In an emergency, it could take place in a small city in the Czech Republic, where we would certainly have a great competition (we could judge it remotely if necessarily).
I just wanted to mention the different possibilities, but my money is on Orlando in early August at a hotel with the name starting with an R.