I have no idea how to post pictures or links here, but if you look at the Kamen Rider Wikia page for the Shift Cars, there's a pic of Shift Colorful Commercial that seems to say that it allows him to create 3D holograms. Road Winters power seems pretty obvious, and we seem to have gotten a pretty clear clue about Burning Solar, although I have this sneaking suspicion that Solar is the Himawari Lockseed of Drive. We've never gone this long after seeing a Shift Car before seeing it utilized, and it wouldn't be completely preposterous for there to be a Shift Car with the sole purpose of protecting Kiriko. Still, I'm waiting for the Tire Koukan.
Deco Traveler and Amazing Circus just seem like they'll be completely random. I thought Traveler looked like a tour bus, so I thought it might be a sound-based Car, but apparently it's some kind of souped up Japanese truck? Circus sounds like a Vegas-esque Car, something gimmicky and silly.
Having seen Type Technic in action, I like the concept that it's more of a support form than anything else. He isn't particularly distinguished by a statistic, but the rearview camera and ability to hack machines are nice touches. The Tire placement does look awkward, and I feel like whatever material they used for the section of costume when he's Tire-less looks cheap. I don't really get the complaint about certain Tires not working though. Dimension Cab with Type Wild would be completely useless. At least Technic could send his head somewhere to spy.