FYI, here's the e-mail I sent their press office on Oct 2, on Oct 3rd Rosso confirms to WGSN that Margiela's gone. I never received a reply, I assume it's because they knew it was going to be announced...
"Hello,
Please beg my pardon for not writing to you in French, my language skills are not strong enough to compose a formal letter and clearly communicate my ideas. I wanted to know if Martin Margiela is still designing for the Maison and what exactly his role is, if any, with the company. Surely you know there are rumors that he has left, but I wanted an official statement from your office. I thank you in advance for your time and your honest response. "