anj85,
It is sad to hear that stage after stage is now getting delayed. I also heard from one of my friend who also bought at stage 5, who has been recently advise that their stage also been pushed out by at least another 4 weeks (anticipated release by Jul) due to council requirements with updated sewerage and stormwater thing... Which required rework by Mirvac.
However, I suggest you all that wait until you have a further commitment from Mirvac, before signing any formal/legal paper work such as building contract in order to avoid such situation.
Thanks,
Neel
27.08.13 Building Contract
03.04.14 Land Settlement
25.06.14 Developer's Approval
09.07.14 Site Start
25.07.14 Base / Slab completion (anticipated)