This does look nice but I'd hold off doing too much work on it for a while. Firstly there are several other options now, some of which are pretty good. Secondly when the Due is released there is supposed to be a new IDE as well, that may well be a full-featured IDE and if it is and it's officially supported that would have to be the way to go.
that this IDE does *not* (on purpose) preprocess the source files before compilation like the original IDE
What other Linux options are there available? I've seen Gnoduino, and had problems getting it to work. As far as a new IDE coming with the Due, I haven't heard that. I hope it's true. Where did you get that info?