Last time, we have rumors about GokaiSilver's mecha, GouJyuJin and its own Legend Machine, Hurricaneger's FuuRaiMaru and just recently, the scans about it has just surfaced the web, confirming these rumors!
GouJyuJin (Trans. Strong Beast God) which accordingly, will be released during late July. This mecha has a 3 step transformation. It transforms from a Dinosaur, to a Drill Battleship, and then into a robo. The robo's right arm is a drill (in a nod to AbarenOh) while the left arm is the Tyranno's head (a fist is inside the head) and the legs are the Tyranno legs. The entire GouJyuJin mecha is blue, with a red head with an anchor-visor motif in yellow and red. GokaiSilver's anchor mark (in blue) is on the chest. Arms seem to be spin via a dial gimmick in the back. There is a union with GokaiOh, but it may only be arm switching.
In addition, the next GokaiMachine is from Hurricaneger and will be called, FuuRaiMaru. Modeled after Hurricanger's FuuRaiMaru, except it is green in color. 
It stores inside GokaiOh by dividing into 5 and utilizes the unfolding gimmick in both GokaiOh arms. Out of the feet appear 3-sided Shuriken. Out of the chest comes a Senpuujin head/helmet. Both Shurikens can unite into a bigger weapon (like Tenkuujin's weapon) which GokaiOh can hold.
Anyways, on top is a set of pictures from the Super Sentai 199 Great Hero Battle and asides from the pic of all the Rangers, we can see a shot of at least 10 giant mecha lining up! Also, here are some rumors, please take it as a grain of salt:
- Kaoru Shiba is the only one appearing in Shinkenger's episode.
- Yousuke/HurricaneRed from Hurricaneger and Ryouga/AbaRed from Abaranger will be back for the TV series. While Riki/Red Turbo from Turboranger and Gorou/OhRed will show up in the movie.
- Kyousuke Jinai/RedRacer's actor, Yuji Kishi have posted a blog post that he made some filming for a tv series two days ago. It doesn't really say which TV series it is, but judging from the smiley he put at the end of his blog post, I don't think it's that hard to figure out which TV series he is talking about.
- The one who taught Joe everything about swords is Barizorg, who was known as Shido.
- Also, GokaiSilver's actor is Jun Ikeda (Hana Kimi) unlike the earlier rumored, Shindou Gaku. Accordingly, his name is Yoroi Retsudou (烈堂鎧) and based on his name, his might be coming from Earth. He is a frivolous show-off and he will debut on the Timeranger Tribute episode. The plot seems to be finally moving when he shows up.
- Asides from that, Ranger Key Set 4 includes Battle Japan, Tyranno Ranger, Red Racer, HurricaneRed and GoseiRed. There are high chances that we will see them in the next episodes.
Source: Henshin Grid, DecaEnd of HJU (link 2, link 3), Gold Samurai of HJU (Link 2), Shougo B'Stard of HJU