Acer Liquid S2 seems to be the company's next flagship device that will supposedly hit the shelves very soon. According to a leaked roadmap Acer Liquid S2 will run on a quad-core 2.3GHz processor and pack a 5.98" 1080p IPS display. The rest of the mentioned specs include 2GB RAM, 16GB internal storage and NFC. The Android version is dubbed K OS, although we are not sure if that is shortened...
Source: http://www.gsmarena.com/acer_liquid_s2_pops_up_on_gfxbench_runs_on_snapdragon_800-news-6666.php