Two different sources have reported to us that the LG G4 with a resolution of 1620 x 2880 pixels. However this is not confirmed.
A rumor article at Value Walk about the Samsung Galaxy Note 5 speculates of the possibility of this phone being the first phone to have a 4K screen.
The value of a 4K on phablet screens is questionable. However, we eagerly wait to see the first 4K phone so we can evaluate it for ourselves.
None of our sources have confirmed that the Samsung Galaxy Note 5 will have a 4K screen and most the people we have talked to do not feel this makes sense as QUAD HD is still underutilized.
We will continue to watch and keep you updated on this rumor.