I think that Mark's status is "day to day." He was injured right before the Aussie Open, but I haven't seen anything definitive recently.
If Scott Draper is being considered for the second singles position, that should tell you that John Fitzgerald is close to the end of his rope with Mark. Even if Mark is healthy, his self-confidence has taken such a hit over the last year that Fitzgerald must consider it very risky to play him.
Here's a question for discussion: if and when Woodbridge retires, should Lleyton stop playing DC like Agassi (until this year), Federer, Henman and Moya have? Is there something to be said for his not wasting his energy on a losing cause when he needs to be battling the top guys?