From the NZIS site:

The frequency and number of selections from the Pool is based on a number of factors, including:

*
the number of places available in the Skilled/Business stream of the New Zealand Immigration Programme
*
the quality of Expressions of Interest in the Pool (as indicated by their points scores), and
*
the total number of Expressions of Interest in the Pool at selection time.


It may be that there werent enough applications and/or the 'quality' was too low, so it may be another few days before a selection is made.