According to a trusted source, Google plans to announce that the Google Assistant will be launching on iOS soon as a standalone app. The announcement could come as soon as Google's I/O conference this week, but it's unclear exactly what Google's plans are at this time. The app would likely feature a blend of the "chat" style functionality in the Google Allo version of Assistant and the voice-controlled version found on Android, but again, details are scant.
We do know that the Assistant for iOS will only be available in the US at launch, and that Google plans to make the announcement in fairly short order. I/O would be a pretty ideal venue for such a launch, as Assistant's SDK was just made available to developers late last month. Bringing the Assistant to the world's second-largest mobile OS would likely encourage more developers to integrate with the app's functionality.
As we learn more about this story, we'll bring it to you. For now, just know that Assistant on iOS is imminent. While we are labeling this story a "rumor" because we don't know what Google's exact timeframe for announcing this news is, we're highly confident that the information we were provided is accurate.