The main problem with the 0.5 project is that the code base is very very messy/difficult to work with. BLUE is well structured and easy to get around, whereas its very hard to do anything in 0.5 at present. That and our SCM coder, trx, is busy with things in real life at present, which would make an update much harder too.
Once BLUE is done and released u'll see why the 0.5 side of things just isnt worth working on any more.