The newly launched moto G XT1068 dual sim. This is an 8 GB version with a SD card slot.
Comparison of specs at gsmarena here
Noticeable upgrades over previous version:
5 inch 720p screen over 4.5 inch 720p
8 MP camera vs 5 MP
Better front facing camera
Front facing stereo speakers
micro SD card slot - expandable up to 32 GB
And gyro sensor (which I think will allow new moto G to capture photo spheres)
And guaranteed upgrade to android L
What are the differences with Nexus 5 (2013)?
Edit: 1GB Ram, 1GB! They have upgraded everything except ram!! How could they!?