A Curve Editor sounds amazing! I'm really looking forward to use it.
I, however, have a question. Is the new editor going to replace the old one?
All I want is not to lose the ability to edit several key frames at the same time, it's the only one thing I think the current editor is superior to any other I've used before. In curve editors it's not as easy as it is in Spine to change a lot of different transformations regardless of the actual information, most of them doesn't even let change more than one curve.