This upcoming release will include light simulation as well as some other visual improvements.
These are a list of features that are included in the beta 1 update:
2D Ray tracing with global illumination
New "Lighting" tab
Modified internal rendering to use 16 bits per channel. This greatly improves color visuals with dark colors or large particles
Added new "Max Dynamic Size" slider
Added new "Min Dynamic Size" slider
Now fullscreen is actually windowed borderless
You can find the current placeholder controls in the new "Lighting" tab