I’ve never used WP followers or e-mail subscription, so, I’m not fully sure what this is about, but for those of you who do I got this message:

Please keep in mind that while your email subscribers will continue to receive email notifications of new posts as before, WordPress.com followers will only see new posts in the Reader. They will not receive email updates unless they subscribe to receive those on your new site. You might want to post a notice on your old site about your upcoming move to keep your readers informed.

So, if you’re a WordPress.com follower and want to continue getting e-mail updates, you’ll have to resubscribe. For the e-mail subscribers, you should be transferred over without hassle soon.

The subscription box is at the bottom of the page.