The newest revision does not boot from current SD images. I'm working to debug why. If anyone else has a board and can test it out, let me know. The eMMC will boot, no problem, so it's just the SD itself.
Model: Pine64 Rock64
DRAM: 1022 MiB
MMC: rksdmmc@ff520000: 0, rksdmmc@ff500000: 1
SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB
*** Warning - bad CRC, using default environment
In: serial@ff130000
Out: serial@ff130000
Err: serial@ff1300