TechNow: Oppo R1S released with LTE, Snapdragon quadcore and better camera.

Oppo has announced Oppo R1S - an upgraded version of the R1 with a faster CPU and an upgraded camera.
  
The Oppo R1S looks absolutely identical to its R1 predecessor, it even has the same footprint and weight. The 5" 720p IPS display also remains intact. The Oppo R1 runs on MediaTek's MT6582 chipset with a quad-core 1.3GHz Cortex-A7 processor and Mali-400MP2 GPU, while the newly introduced Oppo R1S is powered by the Qualcomm's Snapdragon 400 with a quad-core 1.6GHz Cortex-A7 CPU and faster Adreno 305 GPU. The RAM stays the same at 1GB.
Due to the new chipset the Oppo R1S is LTE-capable, but it drops the dual-SIM support. Oppo R1S offers a more capable camera than its predecessor featuring a 13MP sensor instead of 8MP. Its extra features stay the same though - HDR stills, panorama shots, 1080p video recording.

Oppo R1S runs on Oppo's Color OS based on Android 4.3 Jelly Bean. It will become available on pre-order for CNY 2,498 starting tomorrow. You will be able to choose between white and blue flavors. Source