Nintendo Switch Online, the paid online service for Nintendo's hybrid console, was originally meant to launch in Fall 2017 after the trial became available with Splatoon 2. However, we haven't heard about it in a long time and for good reason.
As you can read below, on the Italian website it is now explained that the paid subscription service will be available in Fall (Autumn) 2018. That's a pretty huge delay and one has to wonder whether Nintendo is simply having infrastructure issues or perhaps there will be new features to entice players to subscribe to Nintendo Switch Online. As a reminder, we've included below the official feature list confirmed by Nintendo at the time.
Of course, availability could vary between territories though it would be quite weird in this day and age where services and even games launch day and date globally.
https://wccftech.com/nintendo-switch-online-delayed-fall-2018/