According to a report published on Tuesday, GDR2 for Windows Phone 8.1 will allow the platform to support 2K and the Snapdragon 805 CPU. You might recall that the GDR3 update for Windows Phone 8 brought support for 1080 x 1920 resolution and quad-core processors. Windows Phone 8.1, on its own, enables screen resolutions of 540 x 960 (qHD) and 480 x 854 (FWVGA). It also allows manufacturers to use the Snapdragon 800. But new Windows Phone 8.1 models are already being tested with a higher resolution 1440 x 2560 QHD screen, and a more powerful processor.
Earlier this month, a device (most likely a reference board) codenamed the Qualcomm LiQUID was spotted on the GFX Benchmark site packing Windows Phone 8.1. This device carried a Snapdragon 805 CPU and the Adreno 420 GPU. The Snapdragon 805 will run as fast as 2.7GHz, uses less power, supports Quick Charge 2.0, 4K resolution and a low power DSP for longer music playback sessions. It also will allow for a 55MP camera to be employed.
The GDR2 update for Windows Phone 8.1 is expected to allow manufacturers to use the Snapdragon 805 to power their phones
source: NPU via WMPoweruser