Potential soft opening date of September 1st, 2016.
We start to turn over pieces of the park next January - February timeframe and there's a sequence of handover through 2016 culminating in a soft opening on September 1, 2016.
Source: http://www.arabianbusiness.com/dubai-theme-park-resort-eyes-soft-opening-on-sept-1-2016-616202.html