RoHS (Restriction of Hazardous Substances) is for the most part the lead free solder (or other electronics) specification that manufacturers are having to conform to. It is a very painful transition for soldering of components, as the alternatives do not have some of the nice characteristics of lead containing solder (particularly a shiney finish to indicate a good joint).
I wonder if the Mabuchi motors (and their soldered lugs) are the hold up? What other electronics come in a GWS plane?
I might hold out for the Brushless version, or just bite it and get the NPS white and get two 350's. Waiting on the Early Bird email to see what the prices are.