I have been asking Spark about the state of IPv6 deployment on their network for years (and the answer is always "sometime soon, no ETA"), however today they responded with this gem from tier 2 complex support:
To be honest with you, there is no timeframe for the IPV6 launch.
As to its launch, Spark would only adopt it if it were deemed absolutely necessary.
At this time, we have no residential or business customers who require the IPV6 specification, and thus there’s no hurry for Spark to deploy something that would cost a lot of time and resources for something that isn't required.
This kind of attitude from an ISP really annoys me. IPv6 is one of those things that obviously won't be used until it's available, and until it's available, it can't be used and people will work around its lack.
Spark - sort it out please. It's almost 2017; in my opinion this kind of attitude towards core infrastructure is unacceptable, particularly when you've been promising me for years that it's coming.