As soon as you register, you get subscribed to our "Product updates" mailing list. Everytime our product manager wants to intimate you about a new feature that got added, he sends a mail. There will be a unsubscribe link at the bottom of every email that we send. You could choose to unsubscribe if you feel that we are spamming you (although we really try not to email you with random junk).
There will also be a notifications header on the top that looks like this:
Apart from product updates, this will also have down time notifcations, billing related intimations etc.