Asus G56JR-Ask for a channel partner for getting it. Your average computer dealer might not be able to get it, but as of today, I have checked it and it is available and is in stock(again, you need to contact a dealer who is directly associated with distributor). The price is higher, at 82K with taxes. Now as for incoming Lenovo Y50, I will just continue:
Since you are are just concerned with gaming(I am more concerned with molecular simulation and all) :
GTX 760 < GTX 860(even Kepler version or Maxwell version), and that alone should deter you from buying Asus laptop.
Now, if that thing is sorted out, and you still want to buy Asus laptop(which I personally feel is superior), then this are the additional things you will get : An additional USB 3.0 port, it is a big thing, unless you want to carry a hub around. Better driver updates : As far as I know, Asus updates the non core drivers frequently, along with bios. Better audio system, Lenovo might have JBL speakers, but I have personally observed the 2.1 system in an Asus N series laptop with subwoofer, totally unmatched. And an IPS panel with 92% sRGB coverage(I am not sure about coverage, got the value from a translated review), which again is better than the TN panel on Y50. G56 does have another shortcoming, the Indian version is most probably sold with an Atheros WLAN adapter, which is, I guess 1x1 ?(Y50 ships with a 1x1 adapter too, but atleast it is an Intel one, and confirms to AC standards). The range of Atheros adapter is good, but it falls under "just O.K." category.
In the end, if you want a gaming laptop now, go for G56jr, it is much better than Y510P, or if you can wait, then look for Y50.