@timbl Nothing yet, I must shamefully admit. N3.js started out as with the goal of supporting N3, but along the way, became more focused on Turtle and the rest of the family.
It is, however, still my goal to get to N3 compatibility. At the moment, what holds me back most is the relation between Turtle and N3. Is N3 a proper superset of Turtle, or is N3 the spec as defined there (with some lexical and grammatical nuances from earlier Turtle drafts)?
That said, it should not be too much work, it's only a couple of extra tokens.