dropped into planetside site..and i found this paragraph..

"*Please note that the Technology Preview release is aimed mainly at high end users. It has a powerful and flexible graphical node/graph editor which is used for creating networks of shaders and scene elements. The Technology Preview features a number of high level shaders which create more complex scene elements, such as clouds or rocks, as well as a low level function node system which allows you to create shaders from "first principles", using functions and methods that will be familiar to shader writers. The node editor can be used to unlock the full power of the TG2 rendering engine.

"We are very aware that many users may find the node based interface unfamiliar. We strongly emphasise that the Technology Preview release is aimed at high end users. We are continuing to develop the user interface to reduce the learning curve and make it easier to leverage the power of the TG2 render engine to create scenes of outstanding realism and complexity."

there is your answer....