Was informed by my SA the developer already got the license for the shuttle service. You sure is just a proposal or my SA bluffing me? 

The SA mentioned to Johan Setia LRT station and AEON Bukit Tinggi (no mention of the LRT station). Which might means they intend to 'work together' with AEON instead of fighting (unlike KSL2 Mall). Last check with few SA, Gravit8 doesn't seems to have any plan to bring in cinema which means nearest is at AEON. Also for the Aero Bus Terminal at AEON Bukit Tinggi rear bulding (for KLIA/2 flight if the shuttle service can match the schedule bus timing) and more shopping / dining selection. Beside, Gravit8 mall won't be up for maybe another 3-5 years after serv. apartment VP.
What is Bandar Bukit 3? Bandar Parklands is it?   

I think is for work / edu / shopping to / from other places and most probably not for further south use as you mentioned. My 5 sen.

Just my survey on known contacts.
Johan Setia low - mid income, Bandar Parklands mid - high income, Bandar Bestari (KSL)- unknown (future mid-high income maybe), Telok Panglima Garang low-mid income, Jenjarom - low - high income + taikor, Banting low - high income + taikor alot.

Btw, are your from FullHomes agency?