The new rider after Kiva is called Decade I have find sources and I beleive I have found a true super special awesome information about this new guy. Not only will there be a new rider but also all the previous riders from the other universes are gonna be in it. This includes KUUGA, AGITO, Faiz 555, BLADE, HIBIKI(lame), KABUTO, DEN O, KIVA.
Don't beleive? Plug this in your henshin belt
nah i was kidding here is the real one