Yeah, the UTM and XG are quite different. At this time, I'm not aware of any plans to discontinue the UTM. It will still be supported for quite some time. The XG firewall pretty much adds more functionality to the UTM. The main feature you gain is the security heartbeat that allows your endpoints to integrate with the firewall. If you're interested, there's a little more information available here: https://blogs.sophos.com/2015/11/09/xg-firewall-faq/
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