After this morning's call to re-download the EDGE v1.22 files because of some problems, there's another update at the EDGE site. This concerns the available command line parameters you can use for this brand new source port, and a note about their glBSP nodesbuilder:
GlBSP allows the engine to properly render room-over-room areas. With a 'normal' level, EDGE will attempt to build the nodes for itself when using the TrueBSP renderer, however using the glBSP nodebuilder will do a better job.
There you have it. You can find more information on glBSP at its own website. Plus, why not leave your feedback on the first alpha version of EDGE while you're at it?