The latest model of Raspberry Pi, Raspberry Pi 3 with Broadcom new SoC, BCM2837! This retains the same basic architecture as its predecessors BCM2835 and BCM2836, so all those projects and tutorials which rely on the precise details of the Raspberry Pi hardware will continue to work. The 900MHz 32-bit quad-core ARM Cortex-A7 CPU complex has been replaced by a custom-hardened 1.2GHz 64-bit quad-core ARM Cortex-A53. Combining a 33% increase in clock speed with various architectural enhancements, this provides a 50-60% increase in performance in 32-bit mode versus Raspberry Pi 2, or roughly a factor of ten over the original Raspberry Pi.
Wireless functionality was fitted into very nearly the same form-factor as the Raspberry Pi 1 Model B+ and Raspberry Pi 2 Model B; the only change is to the position of the LEDs, which have moved to the other side of the SD card socket to make room for the antenna/
Key Improvements from Pi 2 Model B to Pi 3 Model B:
Next Generation QUAD Core Broadcom BCM2837 64bit processor
Processor speed has increased from 900MHz on Pi 2 to 1.2Ghz
BCM43438 WiFi on board.
Bluetooth Low Energy (BLE) on board
Upgraded switched power source up to 2.5 Amps (can now power even more powerful devices over USB ports)
Other Technical Specification:
40pin extended GPIO
4 x USB 2 ports
4 pole Stereo output and Composite video port
Full size HDMI output
CSI camera port for connecting the Raspberry Pi camera
DSI display port for connecting the Raspberry Pi touch screen display
Micro SD port for loading your operating system and storing data
Upgraded switched Micro USB power source (now supports up to 2.5 Amps)
The same form factor as the Pi 2 Model B, – the only difference is the location of the onboard LEDs
All of the connectors are in the same place and have the same functionality, and the board can still be run from a 5V micro-USB power adapter, as the previous Pi.