Oppo itself leaked the new R11s duo, but that page was a touch light on specifications. Good thing we have TENAA to fill us in on the details before the November 2 announcement.
The Oppo R11s and Oppo R11s Plus share the majority of their specs, the major difference being the screen diagonal 6 and 6.43 respectively. Both are AMOLED panels with 1,080 x 2,160px resolution and 18:9 aspect ratio.
The duo will be powered by octa-core processors Snapdragon 660 is the most likely chipset, so Kryo 260 cores. The R11s has 4GB of RAM, the Plus model has more 6GB. Both have 64GB of built-in storage and a microSD card slot.
The dual camera on the rear is listed as 16MP + 20MP, confirmed by Oppos own website (although benchmarks claim 20MP + 20MP). The single selfie camera has a 20MP sensor.
Since the Oppo R11s Plus is larger it has a 3,880mAh battery while its smaller sibling has 3,120mAh in its tank. It terms of size, the R11s is 7.1mm thick and weighs 153g while the R11s Plus is 7.3mm thick and weighs 182g.
PS. TENAA photographed only the black model, you can check out the Gold and Red color options here.