Bandai's Toy Catalog revealed the pic of Kamen Rider Build's New form → OctopusLight Form. Kamen Rider Build will use the Full Bottles of Octopus & Light (as in Light Bulb) to transform. The Full Bottle is Light but it will have the elements of Lightning because during transformation, the Build Driver says Inazuma Technician (Technician of Lightning).
This catalog had also revealed the existence of New Form which will appear in Kamen Rider Heisei Generations FINAL. It is still in silhouette and the Full Bottles used by this form is still not known. Based on the design, the left part looks like a Robot. In Build Driver Hacks, there was a sound of "PhoenixRobot" so probably it might be PhoenixRobot Form.
Finally we have the pic of Kamen Rider Close's Lower Body. This scan also says about the existence of Mini Dragon Full Bottle & Mini Lock Full Bottle which will be used by Kamen Rider Close
There are few sources which say about 2nd Quarter Catalog saying there will be appearance of FaustDriver, Neo Smash Full Bottle, Steam Whip, Spider Full Bottle, Night Rogue will transform into Kamen Rider Rogue, Blood Stark transforming into Kamen Rider Stark & appearance of Kamen Rider Spider. But these are all fake. This catalog doesn't mention anything about it.
Kamen Rider Build & Kamen Rider Ex-Aid's Crossover Film "Kamen Rider Heisei Generations: FINAL" will premiere on December 9. Shun Nishime (Takeru Tenkuji / Kamen Rider Ghost) & Takayuki Yanagi (Onari the Detective) are confirmed to appear in the Movie.