Stunning indeed - I think the lightning is the most outstanding achievement in this version; looks like a great balance between warm and cold colors, vivid and desaturated and so on. Not to mention the shadowing is just awesome!
When that's said; because of the Post MSAA in CE3, they blur the textures too much - everything seems a bit low-resolution and blurry, which I don't fancy too much.
On the regard with the SDK-kit; yes, there will be a SDK-kit, similar to the UDK from Unreal. When this will arrive isn't certain yet, but they've
confirmed it at least.
Maniche