Copyright for the next Sentai has been leaked
Jyuden Sentai Kyoryuger (獣電戦隊キョウリュウジャー)! Trademarks for what seems to be next Super Sentai series seems to be have registered under the ID 2012-65209! Jyuden consists of the two kanji characters, beast and electricity, while kyoryu means dinosaur. So the next Sentai series is most likely another dinosaur based show.
"Beast Electric Dinosaurs"
We should have more details around December.