Karou will be appearing in the Shinkenger tribute episode, I'm guessing it's 11. The rumored description was that Joe would remember Silver, the guy who taught him swords. Above pic confirms this as he is sword fighting with Karou.
GokaiSilver tot he left, pics coming next month they say.
new combo for Gokaioh, seems to be in the movie, the fans remind me a bit of Varibloom, so maybe its Goranger.
Silver's name seems to be Shido Bamikku and it seems he is indeed Barizorg.