The price is 3,675 Yen (inclusive of tax).
Shown in the last image is Tamashii Web Shop limited Emergency Deployment Booster Unit compatible for Robot Damashii [Side AS] Arbalest, Gernsback and Falke. Pre-order period was between January 25th and March 8th. Late May release, 2,625 Yen (inclusive of tax).
Apart from Falke itself, the same article also mentioned a special project for Robot Damashii [Side AS] Arbalest, Gernsback and Falke, which will be announced in this month's issue of Dengeki Hobby. It may be referring to this:
Images are from this previous posting.
Bandai Collector & Dengeki Hobby Magazine & Kanetake Ebikawa Collaboration Project shown in last month's issue
Images and information are from ROBOarts Diary.