Rockchip RK3328 (64bit quad-core A53), 1/2/4 GB 1866 MHz LPDDR3 RAM, eMMC socket, 128 Mbit SPI FLASH, Gigabit ethernet, 2x USB 2.0, 1x USB 3.0, microSD card slot... that's a short description of parts of ROCK64.
Moreover on the board are HDMI output 2.0 which supports 4K/60Hz video, 40pin header, jack, IR receiver and 22 pin headers Pi-P5+ bus (GPIO, I2S, Ethernet, power supply and more).
This ROCK64 single-board computer should be availalbe on 1. July of this year.
The price of board depends on 1 GB RAM should be about $25,
version with 2 GB RAM around $35
and variant with 4 GB RAM$45.
Supported OS are Android 7.1, Debian, Yocto and another.