Like push notifications when you receive a Facebook update, e-mail, or tweet? Look elsewhere, as the KIN series won't offer them. According to Microsoft, updates will be sent to the phone every 15 minutes in order to keep power consumption low. Hey, if the battery is going to make it through the weekend (as it is reported to), I suppose constant push notifications are out of the question.
My hope is that Microsoft adds the functionality in the future, but in the meantime, it's manual updates for now. For those interested in the KIN series, is this a "make or break" feature for you?