I'd be a little worried re your subdivision and NBN because it's such a small subdivision! Especially as telstra aren't installing any copper lines any more (hence the requirement of NBN for new developments) - hopefully you'll get NBN though - at least if you do it'll be FTTP (fibre to the premises) rather than fttn (all of that brown "fixed line building" section of that map will get the bastardised liberal govt faux NBN which is fttn (fibre to the node, basically fibre NBN high speed internet to a box that then supplies a crippled version of NBN to the house via the existing copper infrastructure). If you can jump a fence on the weekend and go for a walk through your subdivision you might get lucky and find some NBN pits (the pit covers will have NBN stamped in them) if they've got that far.
It's not the end of the world if you don't have NBN initially - you could always connect to Aussie Broadband's Airmax/Wimax which is decently fast by the backwards internet speeds we currently suffer with (the house I'm in now is a similar distance from the exchange as your new block would be if telstra were still putting in copper lines) - we sync at about 6mbit on DSL2 - Airmax is about 12mbit so not terrible; obviously won't hold a candle to FTTP NBN 100mbit though.
I can't wait for my NBN. Hopefully someone else has connected (and provisioned) our estate before we finish our build and need to provision ours!!
I told all this to my partner and straight away he said he'd totally pay provisioning fee to have NBN but we'll probably be going for a look see to check for these NBN box things...