mountroot> after update

Just updated src on -CURRENT and rebuilt world and kernel. Now I cannot make installworld because system failed to mount zroot.
/boot/loader.conf and /etc/fstab look unchanged. AHCI mode in BIOS is unchanged. Everything looks the same as before the update. I tried to boot from /boot/kernel.old/ and even /boot/kernel.good/ with same drop to mountroot>.

Is it possible to rescue the system?

UPDATE. The reason was probably in upgrading zfs v.3 to v.4 + gpt.
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FreeBSD 9-CURRENT_amd64, zfs v.4, zpool v.15.
 
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