2/2/2015 – Raspberry Pi foundation Launch Raspberry Pi – V2 B+
This has some great new features
- A 900MHz quad-core ARM Cortex-A7 CPU (~6x performance)
- 1GB LPDDR2 SDRAM (2x memory)
- Complete compatibility with Raspberry Pi 1
Related PI foundation blog post
http://www.raspberrypi.org/raspberry-pi-2-on-sale/
Gordon Henderson has a post too, he has also updated the wiring Pi library so that it works with the new Pi.
https://projects.drogon.net/4-pis-on-my-screen-what/