I have played and finished CC. Didn't like it for the sole reason it doesn't explain jack about the fall of guardia, which was my main reason for playing CC. They've left that open for a true sequel, one we are never going to see.
I've had discussions about the fall, and about what happened to crono and marle on these boards before. No real evidence is ever provided if they are either dead, alive, or kidnapped by aliens. I'm hoping this new ending will fix that somehow.
New insights on the fall of guardia would be nice, and some evidence pointing out that crono and marle are still alive would definately be a plus. I'm hoping the fall of guardia doesn't happen anymore, which probably erases CC from canon as well. I can live with that.
New Chrono game would be nice, but i don't see it happening. I'd rather see them clear up the fall of guardia events and go back to making final fantasy(not that those games have lived up to the hype lately).