The guys from GMSArena put their hands on some important information about the upcoming Galaxy Note 4. It seems that the information was sent by one of their sources. In this piece of information the new Samsung Galaxy Note 4 model number is SM-N910. The model will feature a 5.5 inch display with a 2560x1440 resolution QHD. We aren't that sure that this information is quite accurate, because Samsung's tradition is to increase the size of the display on every phablet. As Samsung's Galaxy Note 3 display was a 5.7 inch, it's questionable if the size of the Note 4's display will be 5.5 inch.
Another point of view is that Samsung is maybe trying to put a curved display on the next Galaxy Note 4, instead of focusing on increasing the size of the display,making not such an ergonomic device. This thing is not sure, the curved display on the Note 4, but Samsung hinted at some point that this is a possibility. We will have to wait and see what the next generation of Note will bring.