I'm sure people will be starting to ask "hey, when can we have 1.10", "why haven't you updated yet" etc, so I'm posting this as an easy answer to refer to.
We see that 1.10 is out, and Spigot have, amazingly quickly, got a 1.10 build (Spigot being the MC server software we use).
We're currently testing it out on our test server before we commit to updating the live server. It's a good job we didn't rush in to it, as there was a bug which Spigot have since fixed causing item frames and their contents to disappear, and one where Nether portals would often TP you straight into the void, killing you - so had we upgraded right away, we'd have a lot of unhappy players

We're continuing to test more recent 1.10 builds on our test server, and will upgrade the live server as and when we're reasonably confident that all is well.