The new Raspberry Pi 2 encompasses a significant performance increase over its single-core based predecessors

Now six times faster and with a quad-core Cortex-A7 processor, the Raspberry Pi 2 Model B now features 1GB of RAM memory giving much greater flexibility for your custom projects and hobbyists needs. The operating system kernel has been upgraded to take full advantage of the latest ARM Cortex-A7 technology and is available with the new version 1.4 of NOOBS software (See Note below). Backward application hardware and software compatibility has been maintained with the Raspberry Pi 1 Model A+/B+ so you don’t have to change your system as with the previous upgrade from B to B+

Specification

Broadcom BCM2836 900MHz ARM Cortex-A7 quad-core processor with VideoCore IV dual-core GPU

GPU provides Open GL ES 2.0, hardware-accelerated OpenVG, and 1080p30 H.264 high-profile decode
GPU is capable of 1Gpixel/s, 1.5Gtexel/s or 24GFLOPs with texture filtering and DMA infrastructure
1GB LPDDR2 SDRAM
HD 1080p video output
Composite video (PAL/NTSC) output
Stereo audio output
10/100 BaseT RJ45 Ethernet socket
HDMI 1.3 & 1.4 video/audio socket
3.5mm 4-pole audio/composite video out jack socket
4 x USB 2.0 sockets
15-way MPI CSI-2 connector for Raspberry Pi HD camera
15-way Display Serial Interface connector
MicroSD card socket
Boots from MicroSD card, running a new version of the Linux operating system (See Note below)
40-pin header for GPIO and serial buses (compatible with Raspberry Pi 1 26-pin header)
Power supply: +5V @ 2A via microUSB socket
Dimensions: 86 x 56 x 20mm

Please Note:

Previous versions of NOOBS software (1.3.x) are NOT compatible with Raspberry Pi 2 Model B. You may wish to purchase a ready-programmed MicroSD memory card with NOOBS 1.4 software or program your own after downloading NOOBS 1.4 from: http://www.raspberrypi.org/downloads/