There is a restriction that the Cadets will require 500 hours total time to be based in Auckland. Auckland was recently approved as a Cadet training base by CASA. Considerering that the Cadets will have in excess of 200 hours when joining then they will do 3-4 months line training (including AKL) before being released to line in AKL as 'Junior FO's' with the magic 500 hour total.
If AIr NZ starts external recruitment again then it is inevitable there will be an exodus of Jetstar NZ pilots I would think.