It is officially confirmed, Kamen Rider Birth will indeed appear in the upcoming film, Kamen Rider x Kamen Rider OOO & W feat. Skull: Movie Wars Core. In the picture above, he is seen here helping Accel fight the male Ptera Yummy. Aside from that, here are some rumors regarding his transformation belt, the Birth Driver!
When you insert Cell Medals and turn the handle a "kapon" sound will be activated, transforming the user into Birth. Turning the handle again will activate Birth's six different forms. The belt is said to change color accordingly once it happens.
- When the capsule on the chest is Red, the Breast Cannon (I am serious) is activated.
- Green on the right arm is the Crane Arm.
- Blue on the right hand is the the Drill Arm.
- Orange left hand is Shovel Arm.
- Purple legs are Caterpillar Legs.
- Yellow back is Cutter Wings.
Inserting 2 Cell Medals and turning the handle activates the Cell Burst which is similar to OOO Scanning Charge.
Take note, till actual scans of these forms will be released or toy scans, take this as a grain of salt.
Source: DecaEnd
All I can say is, OOO is taking the flexibility of the coin theme to its limits!