Moto G4 announced with round edges with 5.5 inch of display, Gorilla Glass 3 with 1080p display resolution . It is packed with 3000mAh of battery and it can charge up to 6 hours of power in 15 minutes with Turbo Charger. It is embedded with Octa Core Snapdragon 617.
Camera is packed with 13 MP back and 5 MP front. It is packed with Android 6.0.1 Marshmallow. There are Dual SIM options and both slots pack 3G/4G compatibility.
On other hand, Moto G4 Plus is packed with Fingerprint Sensor and 16MP camera om the rear instead of 13 MP camera on Moto G.
There are some new things software wise that Motorola has announced. You can check the availability and pricing here details for more.