Comes with beam gun, beam saber, Gundam shield, GN Drive, GN Particle storage tank, option hand units and display base.
The bazooka shown in last month's issue of Hobby Japan is from Gundam RX-78-2 Ver. Ka of the same product series I believe, to show you it has such a feature.
Pre-order had started since March 29th. Late July release, 8,190 Yen (inclusive of tax).
Images are from Tamashii Web Shop, this and this previous posting.