iOS 26.3 and iOS 26.4 Will Add These New Features to Your iPhone
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Below, we have recapped known or rumored iOS 26.3 and iOS 26.4 features so far.

iOS 26.3 makes it easier for iPhone users to switch to an Android device. A new tool allows you to place your iPhone next to an Android device to wirelessly transfer photos, messages, notes, apps, and more. You can also transfer your phone number.
In the iOS 26.3 beta, the new tool can be found in the Settings app, under General → Transfer or Reset iPhone → Transfer to Android. It is available worldwide.

In the EU, iOS 26.3 introduces both a Notification Forwarding feature and AirPods-like proximity pairing for third-party accessories like earbuds and smartwatches.
Apple was required to make these changes to comply with the EU's Digital Markets Act.

As of the second iOS 26.3 beta, Apple appears to be laying the groundwork for carriers to be able to support end-to-end encryption for RCS messages.

Starting with iOS 26.3, there is a dedicated section for Weather wallpapers, with three preset options available to choose from. To access them, tap and hold on the Lock Screen and tap on the plus sign in the bottom-right corner of the screen.
iOS 26.3 introduces a new "Limit Precise Location" setting that reduces the location data available to mobile networks to increase user privacy.
iOS 26.1 introduced a Background Security Improvement feature that is designed to provide security updates for Safari, WebKit, and some other system items between iOS software updates. Apple has been testing the feature with updates such as "iOS 26.3 (a)" and "iOS 26.3 (b)," but they do not actually contain any security fixes.

Last month, Apple and Google announced that Google Gemini will help power a more personalized version of Siri coming this year.
The more personalized version of Siri is expected to be introduced with iOS 26.4, following a lengthy delay. The new capabilities will include better understanding of a user's personal context, on-screen awareness, and deeper per-app controls, but some of this functionality might not be available until iOS 27 later this year.
For example, all the way back at WWDC 2024, Apple showed an iPhone user asking Siri about their mother's flight and lunch reservation plans based on info retrieved from the Mail and Messages apps.
Looking ahead, Apple is reportedly planning to launch a full-out Siri chatbot on iOS 27, allowing users to have ChatGPT-like conversations with Siri.

Last year, the Unicode Consortium previewed some of the new emoji that are expected to be added to the iPhone with iOS 26.4.
Here are nine of the new emoji:
Apple most recently added new emoji to the iPhone with iOS 18.4, an update that came out in March last year. iOS 17.4, iOS 16.4, and iOS 15.4 also introduced new emoji over the years, so the timing has become predictable by this point.
Macworld's Filipe Espósito leaked some other potential iOS 26.4 features:
Source: Macrumors