The init family package was upgraded. According to skarnet recommendation, a reboot can be a good idea.
However the boot@ service was also updated. Please do not forget to enable again the service before rebooting: 
# 66-enable -t boot -F boot@ system
Without enabling again the service, the modules-system and local-tmpfiles service will crash. The opentmpfile and modules script previously found at /usr/lib/66/script directory are no longer provided by the boot@ -66serv package but independent and installed automatically with the boot@ -66serv package. This script can be found at /usr/bin directory.
Thanks for your attention.
Thank you for the heads up!
Hello Eric,
no luck this time ... 
# 66-enable -t boot -F boot@ system
66-enable: info: launch script configure of module: boot@ system
boot@ system: info: enable service: tty-earlier@ tty12
boot@ system: info: disable service: devices-crypttab
boot@ system: info: enable service: system-fontnkey
boot@ system: info: enable service: mount-fstab
boot@ system: info: enable service: mount-swap
boot@ system: info: disable service: devices-lvm
boot@ system: info: disable service: devices-dmraid
boot@ system: info: disable service: devices-btrfs
boot@ system: info: disable service: devices-zfs
boot@ system: info: enable service: udevd
boot@ system: info: enable service: system-sysctl
boot@ system: info: disable service: local-rc
boot@ system: info: enable service: local-tmpfiles
boot@ system: info: enable service: modules-kernel
boot@ system: info: enable service: modules-system
boot@ system: info: enable service: system-random
boot@ system: info: enable service: mount-proc
boot@ system: info: enable service: mount-sys
boot@ system: info: enable service: mount-dev
boot@ system: info: enable service: mount-run
boot@ system: info: enable service: mount-tmp
boot@ system: info: enable service: mount-cgroups
boot@ system: info: enable service: mount-pts
boot@ system: info: enable service: mount-shm
boot@ system: info: enable service: mount-netfs
boot@ system: info: enable service: populate-sys
boot@ system: info: enable service: populate-dev
boot@ system: info: enable service: populate-run
boot@ system: info: enable service: populate-tmp
boot@ system: info: disable service: devices-zfs-import-cache
boot@ system: info: disable service: devices-zfs-import-scan
boot@ system: info: disable service: system-Devices
boot@ system: info: enable service: tty-rc@ tty1
boot@ system: info: enable service: tty-rc@ tty2
boot@ system: info: disable service: local-iptables
boot@ system: info: disable service: local-ip6tables
boot@ system: info: disable service: local-nftables
boot@ system: info: disable service: local-ebtables
boot@ system: info: disable service: local-arptables
boot@ system: info: successfully configured
s6-rc-compile: fatal: during resolution of bundle Master: undefined service name system-hostname
66-enable: fatal: unable to compile /tmp/boot:3GSiHB/boot
Any hint to resolve ... Thanks.
@ Galeano

I was able to boot system after downgraded boot@ -66serv (2.4.1-2 -> 2.3.1-1) ... also noticed that only modules.sh was moved to /usr/bin folder, not tmpfiles.sh ...
So, I'll wait a while to Eric check once more boot@ -66serv 2.4.1-2 package, before apply your third suggestion ...
BTW ... totaly agree with https://forum.obarun.org/viewtopic.php?pid=8934# p8934

Many thanks fungal ...

P.S. All is OK now ... rebuilding the boot tree solved the problem ... many thanks again!

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