Big difference: The RaspberryPi has TTL I/O. This makes it easy to do any of a wide variety of hardware interfacing. This new board only has UART ports, which means if you want to do an easy hardware project, you need another microcontroller, tool-chain, etc.
There is a definite market for prototype devices that talk Ethernet, WiFi, UART, SPI, I2C and hardware I/O too. The Raspberry Pi does that well, and inexpensively.