I was hoping for secondary Hibiki riders (Hibiki is only char that has no secondary riders from his serie), but oh well I could guess they dont favour Hibiki.
CycloneAccelXtreme is kind of cool, because
-Its only a possibility form that was never to appear in continuity of TV series (a what-if form in same sense that Odin Survive - if he kept all the 3 survive cards he could achieve it, but thats outside of Ryuki continuity)
-I guess its a dark rider to CycloneJokerXtreme, no? Form fueled by hatred at all, effectively should be Double's dark rider.
-It would be interesting to see how his powers will work; a blend of Double's and Accel powers - again because we had never seen them in TV series
...on other hand its a palette swap, and a waste of slot, no? Its a grey gauge char, AND he is an upgrade form and not standalone character in his own right. They could add him as another grey gauge selection to both Accel and Double, that way he still could be used against anyone in game.
As for having Joker, well, the guy is basically a palette swap and would be "Punch+Kick"Hopper with Rider Punch and Rider Kick, no? And we already have 10 forms in the game that carry Double's face, having 11th would be an overkill. And its no question that CAX would be more original gameplay-wise.