Gimmicks That You Would Like To See Return.

[Golden Phoenix]

Rub Signs must make another appearance, I always wanted a shirt like that

or a pair of pants

[GoktimusPrime]

"Pants?! I did not remove your genitals so that you could wear pants!" - Galactus to the Silver Surfer (Twisted ToyFare Theatre)

[SilverDragon]

Boat transformers. I know we're getting a new one in the form of a RotF Scout toy, but boats and things are still really underused.

Also, a gimmick that I'd like to see not so much return as just appear: Boat transformers that FLOAT. Since it kind of defeats the purpose of having a boat alt-mode if it cannot float in water.

"What! The Decepticons are attacking! I'll go and help stop them! Seaspray, transform! Wait, why am I sink-*glub glub glub glub*"

[GoktimusPrime]

That would be really hard to pull off! In order for the boat mode to float, the hull would have to be a single piece without any gaps that would allow water to leak. It'd end up being the mother of all shellformers... like it'd make Cybertron Thunderblast/Galaxy Force Chromia look good!

[Ode to a Grasshopper]

Maybe small inflatable air bladders on the sides of the vehicle mode would work?

[GoktimusPrime]

Not necessarily inflatable, you could make them out of hollow plastic, similar to the life preserver that comes with Charlie Chopper... although I've never tested the buoyancy of that life preserver.