A review on this Robot Damashii can be seen on YO's Toy Box.
The shotgun is compatible for the upcoming Savage, which isn't too much of a surprise really, since such compatibility is often a must for figures of the same series.
Next few releases are also revealed:
The few already announced include:
* Savage (Gray Color, Sand Color) - Late October release, 2,625 Yen each (inclusive of tax).
* M9 Gernsback (Kurz Weber's unit, Melissa Mao's unit) - January 2010 release, 3,675 Yen each (inclusive of tax).
* Falke - Release date & price TBA.
* Bonta-kun - Release date & price TBA.
What's new is the flight-type add-on equipment shown at the bottom left of the last picture. Will that be released as a regular item, a bundled set with Arbalest or M9, or through Tamashii Web Shop? ^^;
More information is required on that.
All images from Robot Damashii Diary: Link 1, Link 2, Link 3.