-The 4th Robo, as we know, is ChouchinOh, whose motif is that of a Paper Lantern
-The 5th Robo will be called DaiRikuOh, and is supposedly owned by the 7th Shinkenger (ShinkenSilver).
DaiRikuOh seems to be composed of 2 OriGami. The 2 OriGami are UshiOriGami (Cow/Ox), and HayabusaOriGami (Falcon). Besides uniting into DaiRikuOh, both OriGami can combine to form an "Oxcart" formation. The UshiOriGami attaches in front, and pulls Hayabusa, which turns into the "cart" part of it.
In this formation, ShinkenOh, DaiTenkuu, and DaiKaiOh can ride on the oxcart.
-ShinkenOh and ChouchinOh can unite to form ChouchinShinkenOh
-DaiRikuOh and ChouchinOh can unite to form ChouchinDaiRikuOh
-ShinkenOh and DaiRikuOh can unite to form DaiRikuShinkenOh
-ShinkenOh, DaiTenkuu, DaiKaiOh and DaiRikuOh (possibly just the falcon mecha) can unite to form RikuKaiKuuShinkenOh
-IkaTenkuuBuster and UshiOriGami unite into a Horse Mecha, which RikuKaiKuuShinkenOh can ride on
-IkaOriGami, Kyoryuu OriGami and ChouchinOh can unite to form the "KyoDaiTou" IkaChinMaru, which can act a sword, for the rangers, it seems.
-Kyoryu and ChouchinOh also act as weapons for RikuKaiKuuShinkenOh, with Chouchin in "Chouchin Mode"
The above is really awesome, if it turns out to be true. It not only means we get another robo, but the movie special robo will not just be thrown aside either, and, all the mecha will be used in a final formation