
Thanks to
TTT Arc and
FichtenFoo user Spriggan, we have some great new photos of the Hazel Rah. Before this we couldn't even confirm that the name was the Hazel Rah (though we suspected).
The Hazel Rah is a Gundam TR-1 unit (either the Hazel Custom or Advanced Hazel) equipped with the FF-X29A flight pack. The flight pack mounts on the rear movable booster pod and/or the waist of the unit. It consists of any combination of two types of wing-like boosters. In the picture to the left, the art-work shows the carrier-type pod on the mobile suit's right hand side and the standard-type on the mobile suits left hand side. The carrier-type can open up to deploy equipment that a Long Blade Rifle barrel can mount on. Alternatively the Long Blade Rifle barrel is mounted to the standard Hazel rifle, as shown here.

The Hazel Rah can also be deployed with it's "wings" in alternate configurations. To the right we see the Hazel Rah with two standard-type wings on the top and two carrier-type wings on the bottom. The carrier-type wings are show with the Long Blade Rifle barrels, one deployed forward and one back. Their name indicates these barrels may be combination beam rifles/beam sabers, making them a likely predecessor to the Feyadeen Rifle of the
Hambrabi and the
Gabthley. The core MS in this picture also equips the sensor visor of the Advanced Hazel, and based on the darker coloring, this could be the Advanced Hazel or the Hazel Custom after it's been repainted with the traditional Titans blue.

There is also some speculation that the flight pack can work independently of a mobile suit. In this pic, the unit at the top looks like it's deployed that way. There is some speculation on the TTT Arc that this is a predecessor of the Hambrabi.
The theme of names from the Watership Down novel is continued on this mobile suit. 'Rah' is the title given to a chief rabbit. The character Hazel from the novel was not a chief, but was referred to as 'Hazel-Rah' at least once in the novel for the role he played. The flight unit is also referred to as the Hrududu (Furudodo in the original kana). Hrududu means 'vehicle' in Thaline, the language of the rabbits of Watership Down.