I'm not an expert in the Brisbane area, but as Coota mentioned, to do with the new Rail line coming north, and there will be a station in Mango Hill. Was recommended to me by someone affiliated with Terry Ryder.
If Terry Ryder predicts it I would run the other way. 60-70% of all his hotspots over the last 8-9 years have done nothing....
Beenleigh, Beerwah, Deception Bay, Kallangur, Coomera, all predicted 06-07 and have done about 2-3% pa over the past 10 yrs