Awesomenauts will be free for PS Plus subscribers, Sony said. It was scheduled to launch on XBLA on May 2, but that release is still unconfirmed. We've contacted Microsoft for clarification.
Update: Ronimo has confirmed to Joystiq that Awesomenauts will launch as scheduled on XBLA, on May 2. Microsoft has yet to respond, but this is heartening news for potential Awesomenauts fans everywhere.