Kimito Totani, who played Daiki in Kamen Rider Decade, said on his blog that he’s going to start filming something in the new year that his fans should really look forward too.
He doesn’t specifically state the next crossover movie, so it’s still in rumour territory at the moment, but the timeline does point in that direction. We’ll probably get official confirmation in the next month or so if this comes out to be true.