Pursuant to paragraph (3) of the Circuit Advisory Committee Note to Ninth Circuit Rules 35-1 to 35-3, the eleven-judge en banc court decided to hear further argument, but apparently decided not to order further briefing (which appears to be the usual practice). The argument will take place on Tuesday, March 24, 2009 at 2:00 p.m. in San Francisco (limited to thirty minutes per side). I'm going to try to attend and report on it here.
Dukes is currently the second case listed on the Ninth Circuit's "Status of Pending En Banc Cases" page. The members of the en banc court will soon be listed there. At this link, you can download a huge, 421-page pdf file with copies of the petition for en banc rehearing, the opposition, the reply, and the extensive amicus filings on both sides.