Eventually, what will happen is a pluggable editor system and swapping between the new Mini UI and the old standard UI. The pluggable editor system will enable switching between the existing VectorEditor and OnlyPaths editors as well as SVG-edit. Possibly, OnlyPaths will be phased out as SVG-edit supports every feature of the former as well as many more. The priority editors with the new version will be VectorEditor (the Mini UI editor, based on Raphael so it works fine cross-browser, but is also much more limiting than the rest, including OnlyPaths which it partially replaces). SVG-edit is an awesome project which is being actively developed, and will add new features that may make the Ajax Animator viable for more than just stick figures. New features that will come from the transition could include Gradients, Curved paths, Wireframes, Zoom, Groups, Align tools, Rotation and Resizing (without bugs!), Polygon/Polyline editing, to name a small subset. It’s likely that SVG-edit will have far more features by the time it’s fully implemented. It’ll be awesome.
The SVG-edit UI won’t fit well with the Mini UI (which I actually like more), so the classical UI will be revived.