Das sieht vom Script her schon fast wie Unity aus...

Yep, oriented myself on the Unity API. I like the component based design, but if you want, you can also subclass SceneNode to create a self-contained entity.

Any new developments on this?

Yep, still working on this. Had a lot to do the last month, so no time for the engine.

Yesterday i discarded all UI code and i'm now looking into other techniques.
Thinking about implementing WebKit or Gecko as a UI engine but this could be overkill or a huge pile of work.
So my current plans are: Finding an easy solution for a web browser UI or writing a system similar to XAML/WPF and HTML to create your UI by XML and not by code.

Also there were a lot of changes in my development branch:
Huge improvements on the shader system (single shader file)
Shaders now have automatic uniform assignments (from properties)
Normal Mapping is now supported
Removed jitter, added Bullet
Engine now uses multithreading, can defer routines and has a coroutine system
Deferred Asset loading (in other thread)
Game has GameStates that allow to create different states for a game (Menu, Ingame, ...)

Known bugs:
Sound completly broken right now

Do you use OpenTK for the OpenGL/AL stuff?

Yes, why do you ask?

I will most likely switch from SharpDX to OpenTK for my engine framework soon. Since I started to follow all those fancy developers on Twitter I kinda feel lonely/dumb using DX.

Yeah, i really like OpenGL4. The shader programming is imho much better and easier to understand and you don't need those weird semantics for variables.
Also vertex layouting is more flexible.

Little update: Started working on my game:
UI is coded with HTML5/Javascript and Awesomium. Models in the scene are created via Drag'n'Drop

Next Update:
Integrated bloom and improved overall shader programming: