First off, iOS 11.1.1 finally takes care of that weird auto-correct bug which prevented people from writing “I” by always changing “i” to “A[?]”. This has been discovered not long ago, but it’s one of those things that’s incredibly annoying if you’re unlucky enough to be affected.
Additionally, the new iOS version fixes another issue that made “Hey Siri” simply stop working. So while it’s not packed with bells and whistles, iOS 11.1.1 is definitely a must-install release, especially for people who’ve ever seen either of the aforementioned bugs in person.
As usual, if you haven’t yet received the update notification you should go to Settings > General > Software Update on your iPhone or iPad to initiate the process.