Image from Toysdaily.
No matter how Ramba Ral put in in the anime, Gouf does share a lot of similarities with Zaku II, especially its overall design. So I believe Bandai would be reusing some design from MG Zaku II Ver. 2.0 for this upcoming Gouf.
A halt for the MG GM Ver 2.0 variation series? ^^;
Also, Gouf Custom is coming up soon after this I believe. ^^ Wuhhuh~ ^^
Next's up, a full image of Robot Damashii [Side MS] Regnant reported earlier this month:
50cm for the wingspan O_O
Image from Robot Damashii Diary.