In reply to Brin Wilson.

If this is just a theme for the existing admin panel, then plugins like that should continue to work as normal. If it's a complete rewrite of the admin panel, then those plugins would fail to work since they wouldn't know where to hook in to add their input fields etc.

Theme the existing admin panel is risky business. Many have tried doing this in the past, but failed to keep up with the development of WordPress core since their themes were regularly broken during upgrades. A total rewrite of the admin panel (which is much easier now via the new JSON API) allows for a total rewrite, which is less fragile, but will not work with many existing plugins.