Official Raspberry Pi Page

https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/

Key Differences To The Raspberry Pi 3

1.4GHz 64-bit quad-core processor (Broadcom BCM2837B0, Cortex-A53, ARMv8)

Dual-band wireless LAN

Bluetooth 4.2/BLE

LAN7515 6-port USB 2.0 hub (4x usable) with 10/100/1000 Ethernet replaces previous LAN9514 integrated 4-port USB 2.0 hub and 10/100 Ethernet.  (maximum throughput 300 Mbps over USB2.0)

Power-over-Ethernet support using separate PoE HAT.

Shared Specifications To The Raspberry Pi 3

Identical form factor to the RPi3, RPi 2, RPi1 Model B+.

Complete compatibility with Raspberry Pi 1 and 2.

1GB RAM

4 USB ports

40 GPIO pins

Full HDMI port

Ethernet port

Combined 3.5mm audio jack and composite video

Camera interface (CSI)

Display interface (DSI)

Micro SD card slot