There is at least somewhat more current work than that. Tim Newsham was working on a port in 2010. It booted, but was limited (iirc, no networking and some graphics problems). The files from that on my system are dated 2012, but I think that's just from me being careless when I moved something in that year. The Contrib Index [1] reports that tristan did some sort of update to newsham's work, but I don't believe I tracked those changes. I'm not sure what the relationship was between newsham's work and the original GSoC project.
The XO1 still sort of a neat machine, although obviously things have moved on a bit since 2007. The weird stuff they do with their screen is interesting; looks way better greyscale than color. [1] http://www.plan9.bell-labs.com/wiki/plan9/Contrib_index/index.html
