The LG electronics says the LG G3 is, “Coming soon!”, There is an Official Teaser video confirmed Quad HD screen on LG website.
LG also create a micro site for LG G3 which offcially confirmed that LG will announced the LG G3 on May 27, 2014.
For reference, The LG D855 has been spotted in a UA Profile with a 1,080 x 1,920 pixels display. The latest UAProf file for the LG-D855 confirms that it will come with a WQHD (2560×1440) display.
According to the latest UA profile for LG-D855, the model does not 4K playback with H.265 (HEVC),It means that the upcoming LG G3 will not come with a Snapdragon 805 processors, if the latest UA Profile is correct!