It's here! iOS 11.1 just showed up, bringing a number of bug fixes, improvements, and over 70 new emoji to annoy and amuse friends with. For those with iPhones that have 3D Touch built in, you'll be happy to know that the 3D Touch gestures are back for accessing the iOS App Switcher.
The update also provides support for Friday's release of the iPhone X to the general public. iOS 11.1 should appear in Settings > General > Software Update within the next few hours. Although the update lists https://support.apple.com/kb/HT201222 as the location to get information not he security content of the update, it was not yet available as of publication time.
For an iPhone 7 Plus, the update was a 311.2 MB download.