Welcome @steady_eddy91, sifting through all the useful information posted here can be very daunting.
The current release plans (for Stages 3C and 1D) shows the master plan, the areas which have already been sold, and the latest blocks on offer with the respective stages. You can view/download the release plans available on Greenway Living's website at http://www.greenwayliving.com.au/now-selling/latest-release.html.
Up to this point, only house and land packages have been offered. Though the Sale centre team have indicated there may be a handful of land-only offerings closer to the Stonecutter's Ridge boundary and warned these premium blocks will command premium prices.
Greenway and Elara are the only official developments on offer in Marsden Park, currently. I'm sure there will be others, it'll just be a matter of time.
Update: Check out the list of developments in North-west, West, and South-west on the right-hand side of this article (starting about halfway down the page): http://www.blacktownsun.com.au/story/2527483/housing-estates...