The first folding model “iPhone Duo” announced by Apple has revealed that its initial installed OS is “iOS 27.1” from the notes in Apple’s press release. Therefore, iOS 27.1 is expected to be released around October 20th to October 22nd, before the release date.
Furthermore, it has been announced that Siri AI will support other languages including Japanese in October, and since it coincides with the release of iOS 27.1, it is highly likely that Siri AI will also support Japanese at the same time.
New product release and OS distribution schedule
First, let’s organize the announced new product release dates and OS release dates.
- September 12th: Start accepting reservations for iPhone18 Pro series
- September 15th: iOS27 official release
- September 18th: Launch of iPhone18 Pro series (early iOS27 installed)
- October 16th: iPhone Duo reservation acceptance begins
- October 23rd: iPhone Duo released (initial iOS 27.1 installed)
1 updates tended to be delivered in early November following major OS releases in the fall. In fact, last year’s iOS 26.1 was released on November 4th.
However, with the announcement that the iPhone Duo will be released on October 23rd and will be equipped with iOS 27.1, it is certain that iOS 27.1 will be released around October 20th to October 22nd, about two weeks earlier.
Will Siri AI’s Japanese support be released at the same time as iOS 27.1?

What Japanese users most want to pay attention to here is the multilingual rollout schedule for “Siri AI” that was revealed at an Apple event.
Siri AI will start in English as a beta version when iOS 27 is released in September, but Apple has officially announced that it will support languages such as Japanese, French, Korean, Portuguese, and Spanish in October.
Why is it at the same time as iOS27.1?
- Coincidence of delivery timing: The timing of Siri AI’s language expansion (October) coincides with the release timing of iOS 27.1 (around October 20th to 22nd) accompanying the release of iPhone Duo.
- Integrating AI capabilities: Minor system-wide updates (such as .1), which eliminate initial bugs and instability, are the best time to integrate new on-device AI models and language packs into the system.
From this, it can be inferred that Siri AI will be fully available in Japanese from iOS 27.1.
Dual screen dedicated UI for iPhone Duo

iOS27.1 is more than just adding AI languages and fixing bugs. It is expected to include UI optimization based on the dual-screen environment of “iPhone Duo”, which has a completely new design.
- Vertical dock: The dock is placed on the side of the screen for ease of use when holding with one hand or opening/closing.
- 2-screen optimized layout: A design in which the UI is fluidly rebuilt to match the Split View function and content, which displays independent apps on the left and right screens.
In late October, iOS27.1 will be released at the same time as the iPhone Duo, a revolutionary hardware, will be released, which will complete a true Apple AI ecosystem that combines hardware, software, and a Japanese-language AI experience.
Source: iPhone Mania