SE needs to market this game. A lot. This needs to happen at a worldwide event like E3. E3 is all about new games rather than those already released. Logic tells me the chance of this game releasing before E3 is 0.

Even if all beta testing is completed by the middle of May they will hold off the launch until after E3. They may even artificially extend the latter phases for this reason. Alpha was originally meant to end mid-December but they let it run a bit longer to let more people in.

This game will launch mid to late June if there are no delays. Don't expect it any earlier but do expect it later as delays always happen on big projects.