Our ever dedicated friend Evilo has let me know that he, tmator and sspeare have been busy working on a new port of lua with hopes of creating a full luaplayer for the ps2. There is still quite a bit of work to do in order for the project to be at a useful stage but so far the team is showing amazing progress. You can get more info and a video of the basic lua starfield demo running on the ps2 at Evilo's blog.
Also, if anyone is interesting in participating in this project please check out this post at the ps2dev.org forums. There is also a new wiki page put in place for more documentation.
Its nice to see more ps2 dev even when others have claimed it dead and gone. GO PS2DEV!