An order for a few -900ER's sounds like a good move, send them to PB for routes like:
AKL to PER, DPS, PPT & HNL
The 900ER's have the same range as the 800's, the only difference is the extra seating capacity. The 900's (if this rumour is true) will be used in/out of Sydney on domestic ops due to the slot constraints. As it stands
VB have flights every 15 minutes SYD-MEL during the peak periods.
And of course quite a few aircraft coming off lease.
VB have 10?? 737-800's to be delivered this year to replace those coming off lease...this info is straight from their annual report. So the new orders could be for future replacements.