While the document is still a draft a lot of information has been gleaned from it.
● 4.95" 1080p display (IPS TFT for those interested)
● 32GB internal storage (other capacities not specified)
● 2GB RAM
● MSM8974 aka Snapdragon 800 at 2.3GHz
● 8MP OIS rear camera, 1.3MP front camera
● 2300mAh battery
● Sensors: Accelerometer, Gyroscope, Compass, Proximity/Ambient Light, Pressure
● Slimport compatibility
● Micro SIM slot
● Notification light
● Wireless charging
● Bluetooth 3.0 (We assume this is an error – Bluetooth 4.0 appears elsewhere in the document, but according to the last page it's still a draft.)
● UMTS/GSM/CDMA/LTE compatibility
The Nexus 5 has already leaked several times. Once an employee left it charging in a bar. Another time, Google appears to have accidentally shown it in an ad.
Take a look at a few images and the manual below...