If people are interested in this segment - I may keep it updated as sort of a developer diary of a software application...
Physical development (as opposed to the planning and head swimming) of version 4.0 platform has actually begun. Using Python 2.6, WXWIDGETS and CAIRO libraries we have started to build the fundamental building blocks that will be the next platform. Our first application called GREENBEANS which is a carbon emission accounting package will be bilt off this technology and give us some real-world tests to play with.