Looks like Westpac are trying to entice some more home loan customers. Not sure about their interest rates, but if they can match or beat your current rate it could be a good deal.
Available for new home loan refinance applications submitted by 31 March 2019 and settled by 31 May 2019 under the Premier Advantage Package.* $250k min loan size and $395 annual package fee applies. Excludes refinances within Westpac Group."