Always a chance of soft openings.
However, there will be press events happening for the new land just prior to its opening.
Don't know if they will allow regular guests (or AP holders, and/or DVC) into the area early , but anything is possible.
The soft openings often happen.
But, don't make plans based on their "possibility "
Wait until something is announced.
How do they pick DVC members for a soft opening event ???
What kind of crowd/stess does a press event put on the park and/or World?