So the 2071 Rider is named Kamen Rider Century, whose title is Mirai no Keiyakusha (Contractor of the Future)
Also, for the OOO sequel, the story will be set in 2021, 10 years after the original series' ending. The enemy will be the King AKA the first OOO who has managed to somehow find a way to come into the present from 800 years ago. Causing massive destruction in his wake, he threatens to bring ruin upon humanity. At the same time, Eiji, who has recently came back from his journey, together with Date, Akira and Hina, forms a resistance to fight against the King. Will the day of reunion with Ankh finally come?
The new Tajadol form is called Tajadol Eternity