Whilst I don't know cost wise how much they'll be able to include alternate heads and belts and stuff, I would absolutely love to see that for their first set of Chronicles/collector turtles.
Give me a relatively classic design (with the brown wrist, elbow and knee pads rather than the modern wraps). Each turtle can have a slightly different build (but not extremely different, you should have to look close to notice), slightly different shades of green (so a nod to the vintage line but no where near that different). Swappable belt buckles (initial and knot) and swappable heads (colored and red bandanas). Add in a few alternate hands, signature weapons and I'd call that good to go. Realistically I'd take colored bandanas and knot belts but it would be nice to get swappable parts.