Raspberry pi 2 B is on sale now.
Its more faster then Rpi v1 b+ and its same price as b+.
- A 900MHz Quad-core ARM Cortex-A7 (~6x performance)
- 1GB LPDDR2 SDRAM (2x memory)
- VideoCore IV 3d GPU
- 4 USB & 1 Ethernet
- 1 HDMI and GPIO pins same as Rpi 1 b+
With the power of the ARMV7 it can run Windows 10, and other big linux distros like Snappy Ubuntu.
For more information click here