You realize you could do this yourself?
Just make a cronjob that runs every Sunday at 2AM (or whatever schedule you want) that does something like
freenas-update upgrade
reboot
You get the reboot every Sunday even if there is no update, but you might not care. :P
Keep in mind that you will have to change the "train" as time goes on, so even if it is "automatic" it wouldn't be entirely "carefree".
Personally, I'm very much against automated updates. Too much room for things to go wrong and you may not be able to figure out easily what went wrong if suddenly something broke. I prefer to be actively involved in the upgrade process.
And for the record, we already get emails:
A new update is available for the FreeNAS-9.3-STABLE train.
Changelog:
#6951 Bug Important ix-activedirectory is deleting computer object on service stop
#7950 Bug Nice to have Fix rsyncd.conf gid field parsing (allow spaces in them and improve delimiter logic)
#9091 Bug Nice to have Fix Cron task's escaping of "
#9184 Bug Nice to have Update.failed
#9802 Feature Nice to have Provide a method for picking the kerberos principal when multiple principals are present in a keytab
#10353 Bug Nice to have Fixes an issue with manual updates.
#10354 Bug Important cifs issue with how disk space is presented in windows when quotas are set
#10361 Bug Expected Fix a traceback on multiple choices validation error
#10400 Bug Important Leave "Physical Block Size Report" disabled for upgrades
#10408 Bug Nice to have Creating a jail and then rebooting/creating a new jail forces a refetch.
#10418 Bug Important CIFS "Local Master" always in effect.
#10442 Bug Nice to have Merge non-critical changes from upstream FreeBSD
#10444 Bug Important Filters out the boot media during installation.
#10447 Bug Nice to have Bad spelling, and general bad quality warning message in GUI
#10454 Bug Important iSCSI Service wont start if path to extend contains a space
#10472 Bug Expected Fixes a typo in the Update module.
#10507 Bug Nice to have flake cleanup of generate_sssd_conf.py
#10518 Bug Nice to have pyflakes doesn't like the update library code
#10535 Bug Important Active Directory pagesize is not being passed along when performing queries
#10560 Feature Nice to have Add zfslower.d to the image
#10574 Bug Expected LDAP service fails on server with too many accounts
#10595 Bug Important Disks referenced by numeric ID should be kicked out of the pool when they are replaced
#10601 Bug Nice to have Group rename/delete not consistent to Samba groups
#10612 Bug Critical Fixes a GUI Upgrade (aka Manual Upgrade) problem.
#10613 Bug Important SAMBA users not in tdb
#10649 Feature Nice to have Trims down the install environment a bit for space reasons.
#10655 Feature Important nut v2.7.3 needed for Tripp Lite SMART500RT1U UPS
#10680 Bug Expected FreeBSD-SA-15:13.tcp
#10719 Bug Important Export Recycle Bin
#10769 Bug Nice to have App fixes for FreeBSD security advisory 2015-07-28
#10772 Bug Expected AD Kerberos does not work
#10792 Bug Important Remove "exclude dataset" UI from Replication Tasks
#10801 Bug Nice to have set AD timeouts to a higher value
#10807 Feature Nice to have Revise FreeNAS zfs snmp stats
#10814 Bug Nice to have stack trace when trying to save forms where run() is used without a timeout because django doesn't like signals
#10840 Bug Expected Fix zfsL2ArcSize (.1.3.6.1.4.1.25359.1.3.5.0) snmp OID
#10857 Bug Expected all drives probed by grub on upgrades and cleanups
#10861 Bug Important sas3flash looks for /dev/mpr3_0
#10862 Feature Nice to have Update mpr driver to version 9
#10868 Feature Important Add sas3ircu to the build
#10908 Feature Important add alerts for mpr 12 gbps HBA firmware mismatches
#11027 Bug Nice to have Fix multiple integer overflows in expat library
#11042 Bug Expected used extents are not removed from choices in the associated targets drop down
#11068 Bug Expected Fixes for FreeBSD IRET handling vulnerability
#10654 Bug Nice to have sssd does not pull user identification information when using an anonymous LDAP bind
#10978 Bug Expected Be wasteful but clevererer about partitioning installation media.
#11012 Bug Expected Unexpected server bounce at midnight
#11053 Bug Nice to have USB to SERIAL Driver
#11092 Bug Important Anonymous bind attempt instead of GSSAPI
#11118 Bug Expected Generation of sssd.conf is broken
#11129 Bug Expected App SA-15:22.openssh
#11138 Bug Critical NFS4 and Kerberos broken because of new keytab handling
#11279 Bug Nice to have Fix reporting of replication progress in some corner case
#11300 Bug Nice to have CVE-2015-5722 malformed DNSSEC key can cause a validating resolver to exit due to a failed assertion in buffer.c
Tada!
