This "map is coming soon" thing we are hearing since more than two months. LoL :))
Cinsidering the name of the owner, it sounds good project. But with nothing on ground, you are taking risk if you are investing at this point of time.
I agree with Mr. Khan that you have to take risks in property investment if you are looking for good returns. Playing safe in this business means less profit, long lead time.
I advise not to buy files at this time, being highly exposed to risk factors. Once development starts and map comes out then you buy. I know then the price will not the same as of today. But if you carefully calculate risk factor vs expected returns, as of today and as of few months later (when map is there and development started), your proportional return will be much higher.