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The gattai of 12 machines in Engine Sentai Go-onger.
This is the biggest gattai if I'm not mistaken, the previous GoGo Sentai Boukenger has one huge gattai as well, but the limit was 10 machines. This new Engine-Oh has two more, thus breaking the record ^^
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An unofficial illustration of the G-12's gattai.
Have you noticed that all the new gattai of Engine-Oh are just appending new machines to his shoulders, feet and back? The most important joint part - its torso and thigh are still from the very first Engine Oh. That's like putting on a lot of weight for Engine-Oh, plus asking him to wear heavier boots too. The lack of creativity is one thing (sorry Go-onger fans ^^;), I'm more concerned about how the suit actor feel about such design XD
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A new triple-machine gattai. Looks like the theme is ancient land beasts this time?
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New weapons for the Go-ongers, and another robot which reminds me of Warior Wheel from Zeo Rangers (the Power Rangers equivalence of Oh Ranger).
Images above are from Toysdaily.
Another "not-exactly-new" gattai is Engine Dai-Shogun, the gattai of three new Engines that will only appear in the theatrical version of Engine Sentai Go-ongers, called Engine Sentai Go-onger: Boom Boom! Bang Bang! GekijōBang!!.
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Carries a very "fat" katana XD
The interesting point about this movie is that it will premiere on the same date as Kamen Rider Kiva: The King of Hell Castle - August 8th. There was a promo for the movie in Episode 26 of Kamen Rider Kiva. I suppose there was teaser for Kamen Rider Kiva's movie inside the last episode of Engine Sentai Go-ongers as well. Some screen shots from the movie:
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"Family photo" of the cast members, and Go-on Silver and Go-on Gold's Samurai appearance in the movie.
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The villains' design and Maken Castle (魔剣城).
Amiami has listed Engine Dai-Shogun to be available by mid September at 7,140 Yen (inclusive of tax).
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The transformation method is all the same actually, with just added parts and altered color scheme. Not sure if it's compatible with the other machines.
Images from Amiami.