After a decade or more of development .. Max ( the other one ) releases Glass, a replacement for VID using dataflow techniques. See http://www.pointillistic.com/open-REBOL/moa/files/glass-distro-R1.zip
Visual Interface Dialect (VID) http://www.rebol.com/docs/easy-vid.html VID is REBOL's Visual Interface Dialect. A dialect is an extension of the REBOL language that makes it easier to express or describe information, actions, or interfaces. VID is a dialect that provides a powerful method of describing user interfaces.
What would Glass allow Synapse to do that it currently doesn't have ? How does RebGUI fit in with all this ?
Glass uses a dataflow engine which might make the GUI easier to handle ... but it's not proven yet. And it's incomplete.
A much more modern look, the ability to link fields to each other automatically, better keyboard control .. but it's a long way off yet.