Reused almost universally as the same character in mostly the same deco (The only real exceptions being Skywarp and Hot-Rod-impersonating-an-officer).Quite a bit of EarthSpark is reused Cyberverse molds though.
We'll probably never see any of Twitch's (*checks*) five molds reused (unless Twitch herself gets thrown into the next line as a fill-in character). The other Terrans (and Elita-1) are also virtually guaranteed to be one-and-done single-use molds. Ditto for redesigned characters like Megatron or Bumblebee.
Hasbro just doesn't seem interested in repaints anymore. When was the last time we got so much as a Bumblebee released in any other colour but yellow and black?