I suspect we will here something in the next few days because, yes, the company needs to give notice. We don't know when in September the classes will begin... for all we know it could be the end of September. I would venture to say that the people who bid for September classes probably are ready to go to training on relatively short notice. Also, there was a box to check if you are available for training at the last minute (to accommodate cancellations).
I don't think a short-order C-11 filing would hinder MDA progress. The aircraft are still coming, at least for now, and the company seems more intent than ever on building up E170 flying.
I am monitoring the Hub a couple of times a day and will report any progress. If anyone receives notice of their class dates before the Hub postings, please, post it here immediately. There seems to be a couple of days lag time before something makes it to the Hub.
Good luck everyone on getting the classes you want.
-DCAflyer