I just got a call from a Disney Customer Service Rep in response to an email I sent regarding RoL planning. He said that they will make an announcement on the Disney Blog this Saturday, April 2. I asked if was just more fluff or actually giving dates of bookable dining and extended hours. He said that although he could tell me, typically once this type of announcement is made, I should be able to book dining the same day or the next day. Although it's not concrete, he sounded very sure of this information.
Oh, and congratulations on the baby!