Currently there is no way to contact your affiliates in a mass emailing through JVZoo. You can announce the release, and any affiliates that have purchased from you and have opted in to your notifications will also receive that notification. The only way to contact affiliates is through the Message System in JVZoo. You'll find an envelope next to each affiliates name on the Your Affiliates page.
Many vendors ask affiliates to optin to an external list in their auto responder so they can keep in closer contact with them.