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Paul Rubens himself discusses this with MTV in an interview published December 1, 2007:

==== Though he said he hasn't been trying "super hard" to get them greenlit, he said, "I feel like in the New Year, I'll switch into a higher gear and see if I can move [them] forward." Unsure who to ask to direct the films, Reubens admitted he's talked to "Big Adventure" director Burton. "I have talked to Tim about one of them about a year ago. But Tim is booked. I think he would be interested in it, but he's really busy."

Still, the search will continue and Reubens remains optimistic. "I think it's really just a question of the right person coming along. I've had opportunities to do [the films] with people who didn't feel like the right people. It just takes one person." ====

Source: http://www.mtv.com/movies/news/articles/1576172/20071210/story.jhtml