# status image with pv
dd if=2016-05-27-raspbian-jessie.img  | pv | dd of=/dev/mmcblk0 bs=4M

# New status option added to dd (GNU Coreutils 8.24+)
dd if=2016-05-27-raspbian-jessie.img of=/dev/mmcblk0 bs=4M status=progress