It's been quite hard to find information about the re-analysis. It looks like there was a press-release in May last year where the pingers were identified after a re-analysis of the Emeraude towed-array sonar tapes:
Sadly, there are no references to source material, and a quick search through the BEA at http://www.bea.aero/ (the French aviation accident investigation agency) didn't provide immediate satisfaction, alas.
That reminds me of how Gauss was able to use very limited information to locate Ceres after it had moved behind the sun.