I'm going to go against my normal "later than sooner" beliefs and say it will be open Memorial Day Weekend. Disney (and other Orlando parks) has had that weekend as debut time of late. The area really hasn't much in the way of complicated theme, the rides almost done, now they need some landscaping and adjustments. No reason it can't be open before summer .......... when crowds of school age kids come.
JMO, of course only Disney knows.