They're pretty vauge for a reason. PR pushed for an open date to announce with Antartica and it ended up being way before it was really ready to be open. (Usually they have 4-6 weeks to officialy run/test ride, train employees, get animals acclimated to the new environment. For Antarctica, they ended up having 2 days). When they know a date, they'll announce it.
Based on what you can see from Shamu Stadium, they look like it's coming along nicely and will probably be open before Memorial Day (so, Spring sometime) if I had to guess.