Samsung Galaxy S Duos 3 has yet to go official but it is already in stock with Mumbai based Mahesh Telecom. The Galaxy S Duos 3 has the exact same model number SM-G313HU as the Ace NXT (SM-G313H) but comes with an upgraded camera.
The Galaxy S Duos 3 is a dual-SIM phone and comes with a 4-inch WVGA (800x480 Pixels) display, 5 MP primary camera with LED flash and a VGA front-facing camera. There's FM Radio onboard as well. An un-named 1 GHz dual-core processor powers the S Duos 3 with just 512 MB RAM (Galaxy S Duos 2 GT-S5282 had 768 MB RAM) and 4 GB ROM (2.1 GB available) which is expandable using a microSD card slot.
Connectivity options include 3G HSDPA, Bluetooth 4.0, WiFi, GPS and 1500 mAh battery to keep the juices flowing. The Galaxy S Duos 3 runs Android 4.4 KitKat and has an MRP of Rs. 8,590. But the phone should be available at about Rs. 7999 according to the source.
Source: Mahesh Telecom