I got an email notification too. Thanks to the person (sorry I forget who it was) who put up the instructions to use the "Communications" page to track discussions. I'll try to find it in the migration discussion and thank them directly.
Yes. And you can turn that off too. What you get emailed on can be set fairly granular so you don't get emails every time someone replies to a thread. I have mine set to email me just on direct messages, mentions, and friend requests, and to send a twice weekly summary on other activities (new threads and replies).