Nexus 5 specs that are confirmed via FCC documents
Model #: LG-D820 (LG-D821 is for Rogers/Bell)
Carrier: AT&T, Sprint, T-Mobile, metroPCS, Virgin Mobile, Boost Mobile [Verizon will not get Nexus 5]
Networks: GSM/CDMA/WCDMA/LTE
Screen: 4.96 inch 1920x1080 IPS LCD
Dimensions: 131.9mm x 68.2 x ?? (no depth noted) [in comparison, the Nexus 4 is 133.9 x 68.7 x 9.1]
SoC: MSM8974A (Qualcomm Snapdragon 800)
GPU: Adreno 330
OS: Android 4.4 KitKat
Camera: 13MP Sony IMX135 Exmor CMOS Sensor F/2.4 w/ OIS and 2.1MP front facing camera (See comparison video, check the LG G2). <--- based off the LG G2 sensor if they use the same parts, so count this as a rumor!
Qi Wireless Charging
WiFi 2.4GHz b/g/n/ac + 5GHz a/n/ac
Bluetooth 4.0 + BLE (Bluetooth Low Energy)
2300 mAh non-removable battery
NFC

Model #: LG-D820 (LG-D821 is for Rogers/Bell)
Carrier: AT&T, Sprint, T-Mobile, metroPCS, Virgin Mobile, Boost Mobile [Verizon will not get Nexus 5]
Networks: GSM/CDMA/WCDMA/LTE
Screen: 4.96 inch 1920x1080 IPS LCD
Dimensions: 131.9mm x 68.2 x ?? (no depth noted) [in comparison, the Nexus 4 is 133.9 x 68.7 x 9.1]
SoC: MSM8974A (Qualcomm Snapdragon 800)
GPU: Adreno 330
OS: Android 4.4 KitKat
Camera: 13MP Sony IMX135 Exmor CMOS Sensor F/2.4 w/ OIS and 2.1MP front facing camera (See comparison video, check the LG G2). <--- based off the LG G2 sensor if they use the same parts, so count this as a rumor!
Qi Wireless Charging
WiFi 2.4GHz b/g/n/ac + 5GHz a/n/ac
Bluetooth 4.0 + BLE (Bluetooth Low Energy)
2300 mAh non-removable battery
NFC