NetbookInstaller 0.8.5pre is now officially released. There will not be a final release of NBI 0.8.4. This is a preview / prerelease of the changes in store for 0.8.5, there are bound to be numerous bugs. Once bugs reported to Meklort are worked out + features finalized, he will release a 0.8.5 RC and go from there.
This version is very experimental and will most likely break things that are working. There are a few major changes in this version that have not been very well tested, so there may be regressions issues. The main highlights include that NetbookInstaller and NetbookBootMaker have been merged into one application. As far as Meklort can tell, there shouldnt be any issues with this.