New kickstarter project after very popular Onion Omega called Onion Omega2 in two version.
What we can except from $5 device?
580 MHz CPU
64 MB Memory (128 MB Memory for Omega2 Plus)
16MC Storage (32 MB Storage for Omega2 Plus)
USB2.0
MicroSD slot
WiFI 802.11b/g/n
15 GPIO
2x PWM
2x UART
1x I2C, SPI, I2S

You can buy additional expansion boards like:
Expansion Dock ($15) - GPIO, USB - UART convertor for direct connection between PC and Omega2 through serial terminal

Mini Dock ($15) - smaller version of Expansion Docku in size like Omega2

Power Dock ($15) - power supply for Omega2 via Li-Pol bateriy and it contains charger IC

Arduino Dock R2 ($15) - Arduino Dock with Arduino Uno rev. 3 connectors

OLED Expansion ($15) - board with monochromatic 128 x 64 OLED

Externet Expansion ($15) - board for connection of Omega2 to internet through RJ45

GPS Expansion ($25) - board with GPS receiver by uBlox


and a lot of next expansion boards

kickstarter project there: https://www.kickstarter.com/projects/onion/omega2-5-iot-computer-with-wi-fi-powered-by-linux

via: http://www.cnx-software.com/2016/07/20/onion-omega2-is-a-5-linux-wifi-iot-board-crowdfunding/