Two popular phone retailers, DirectD and SatuGadget already have grey market stocks of the Redmi 3.
While the prices aren't prohibitively expensive, they're much higher than the phone's original pricing in China. Granted the phones will usually see a small markup once they arrive here, but in this case, it might be worth waiting for official stocks to come in.
DirectD is selling the phone for RM689 while SatuGadget is selling it for RM688. For that price, you might be better off getting the Redmi Note 2 instead, which for the same price offers a fingerprint scanner and slightly better specs