The master development plan for both zones are encouraging. I see a of activities ahead that will definitely spur economy growth. How much and how extensive are just statistics.
I personally may think of investing into a Golf Villas while waiting for the growth. One of the key eye catching project of Iskandar Forest City. Fringe Villas with just 2000 over sf is my preference. Just good enough for a family short stay. Play a round of golf and drop by Singapore for another weekend with kids.
Investing into lifestyle while enjoying return of capital or even Homestay in luxurious form may generate good return.