"Based on our calculations, it takes more than 3 ½ years (43.5 months) for the average case to proceed through the basic reexam process to a final conclusion... A 95% confidence interval suggests an average pendency for appealed cases (again, assuming no rework) is between 5 and 8 years" http://271patent.blogspot.com/2008/05/another-critical-study...
This is to the point where I'm not sure the courts take reexaminations seriously as a defense. In the handful of patent cases I've paid attention to, the fact that a patent was initially rejected in a reexamination had little impact on how the court proceeded with a case. While it's possible the USPTO will fast track this particular case, if I was a developer currently being sued I would not have any confidence that the USPTO will bring any relief before I was due in court.