Right now the shader graph is very much a proof of concept but I think it's at a good enough stage to let people play around with it. We wanted to ship it as early as possible so it didn't stay on a branch for 6 months.
We're planning on beefing up the UI, mainly having property editors within the node UI itself. We will also be adding many more nodes and different kinds of shading models like Unlit and Post Processing.
Further down the line we want to think about if and how we can allow more complex shaders to be made in the graph, like geometry and compute shaders. At the very least we should allow the graph to change the vertex shader.
Modibility is also something to think about, should we let users code their own nodes? Will that cause problems with people sharing graphs?
Try it out and let us know what you think.