It's great having access to the Water Card in the Portal, and being able to remotely reboot the hub is a nice design improvement. Thanks for continuing to improve the system.
Will we see an update for the app for iPhone X users for it to utilize the full screen anytime soon?
An update to the iOS app that takes full advantage of the size of the iPhone X's screen should be available within a few weeks.
Yes, after the hub is rebooted all your devices will be available (assuming they were available before you rebooted the hub - rebooting the hub won't make a device that is offline say to due to low battery come back online by itself).