For starters, the show's logo is said to look like a game developed by Level 5, the game studio behind Yokai Watch and Inazuma Eleven. The show's heroes are: Don Momotaro (red), Saru Brother (blue), Oni Sister (yellow), Inu Brother (black), and Kiji Brother (pink). Don Momotaro, Saru Brother, and Oni Sister will have actual costumes, while Inu Brother and Kiji Brother are CGI characters.
The collectible items are called Avataro Gears, and these items will also feature legendary Red heroes. The power-up gears are called Avataro Gear Alter. In addition, the team's transformation device is called the Donblaster, and there is seem to be an "avatar" element to the transformations. This item has two muzzles that rotate while firing. As for its appearance, it is describe to resemble the show's bike, the Enyarideon and Zenkaiger's Geartlinger. This item can read Sentai Gears, Avataro Gears, and Avataro Gear Alters.
Don Momotaro has a metallic pink peach symbol on his head, and transforms using the Geartlinger until March. He will start using the Donblaster after March. His personal weapon is called the Zanglassword and it can communicate with the Donblaster via infrared data communication, which includes performing finishers.
Saru Brother is a gorilla, Oni Sister uses a spiked club weapon and wears a skirt, Inu Brother is a "3 heads tall" cartoon dog that fights with a shuriken, and Kiji Brother is a tall slender figure with wings that grow out.
The Enyarideon, which is said to be Don Momotaro's bike has a a robo half mode can combine with Zenkai Juran to form the Don Zenkaioh. The Change Heroes figure line of toys can ride said bike mode. Speaking of stuff from Zenkaiger, Zenkaizer is said to still appear in the series until at least June, and will transform into Zenkaizer Black. He will of course, get a new Change Heroes action figure.
More on the mecha, using the Avataro Gear Alter, Don Momotaro transforms into Don Momotaro Alter, a CGI robot. In addition, there will also be Legendary Avataro Gear Alters, and it allows the team to summon and combine with past mecha. Some of these are: ToQGer Gear Alter, which summons #1 Ressha; and the Zyuohger Gear Alter, which summons a Eagle/Shark/Lion-type cube.
Aside from the Alters, the series will not get any new mecha until June. The Alters are said to resemble Akibaranger's Itashar Robo, and what's interesting about the Alters is that they are not DX robots, but they are under the Change Heroes line. It seems that Donbrothers will not have any giant robot battles, instead the Alters shift the battle into another dimensional space similar to the Space Sheriffs in the Metal Hero franchise. Lastly, Don Onitaijin is said to be some kind of a super gattai mecha.
[Source: Dukemon of Rangerboard (link 2)]