Main gimmick is Transformation, followed by
~Masters, Head\Target\Power, I don't care!

Oh, lightpiping eyes!

One other one that I would like to see expanded (but will prove unpopular) would be Stealth Force.

I loved that the vehicles had armed modes. I'd love to see TRANSFOrming toys with vehicle modes where you could have them also transform into weapon bearing vehicles.

Make them Headmasters and I'd be in heaven!!

A final one I'd like to see is Transformers wwith glow int he dark/lighty lines ala War/fall of Cybertron. Slap some Tronnage on those bots for me will ya HAsbro!