If it will be a 5.5 inch screen then these are likely specs:
5.5 inch QHD display
Snapdragon 805 with 3 GB of RAM
13 MP OIS Camera
Improved front camera
16 and 32 GB
3000 mAh battery
Edit: HTC is the only manufacturer I see making the Nexus 5 (2014). If they did then it would probably also have boomsound speakers.
If Google went the 5 inch route:
5 inch 1080p display
Snapdragon 805 with 2 GB of RAM
13 MP OIS Camera
Improved front camera
16 and 32 GB
2600 mAh battery