It's taken a few different approaches to continuity. For instance, Sky Lynx never had that particular character arc before. It was usually just an ego the size of Cybertron. Scorponok is ususally a decepticon and rival to Megatron, not the last of another species enslaved by the quintessons. And speaking of the Quints, Sweet Primus that was new. Five faced demons with big ambitions and few morals, yeah sure, but, uh... Yeah.
Elita was awesome, with a bit that is so Rooster Teeth. Kindness, mercy, and a belief that people can be better.
And that last bit... I think the Allspark has been busy on Earth. I admit I am sorry we never got to see them on Earth during Earthrise, but still, DINOBOT! *Happy dance*