Here are the official Bandai images of the upcoming Skydain and Landain from their S.H. Figuarats line.
Together they are known as the Space Ironmen Kyodain and are and homage to characters from the TV series of the same name (also created by Kamen Rider creator Shotaro Ishinomori.) However, this time out they appear in Kamen Rider Fourza and aren't brothers, but rather brother and sister, and also play the role of villains.
Both are Tamiashii exclusives. Sydain will be Y4,410 (approx $58.00), Groundain will be Y4,210 (approx $55.00)