Do you know at what time the new date is released? Is it at midnight, or is it the next morning after a certain time?
Also, is it okay to book 2 separate one way trips, if only the departure date is released, instead of waiting for return flight? I'm afraid if I wait for both dates to be available together as roundtrip, the departure airfare will have gone up, because the prices are cheapest as soon as flight info is released.