The Bloomberg piece has another mistake that is significant, IMO: In reporting the 3Q10 sales of Enbrel, the article counts only the portion booked by PFE and overlooks the portion booked by AMGN.
RIGL does have a JAK drug though I doubt it is currently being developed for arthritis. Maybe they have plans for that indication down the road. And if AZN is a syk inhibitor then its not a late stage jak drug.