WWDC 2026: What Developers Need to Watch Tomorrow

The WWDC 2026 keynote is tomorrow, Monday June 8 at 10am PT. iOS 27 developer beta drops immediately after the keynote — so you'll have something real to dig into by the afternoon.

Most coverage will focus on the consumer redesign. This is the developer angle — what actually changes your roadmap.

Siri Gets Rebuilt on Gemini

This is the headline. A Gemini-powered Siri built on Google's 1.2 trillion parameter model is expected to debut at WWDC 2026.

Apple is also testing a standalone Siri app designed to compete directly with ChatGPT and Claude. The push-to-talk button stays, but Siri becomes a proper AI product alongside it.

For developers, the integration mechanism is App Intents — not the old SiriKit. The Gemini-powered Siri architecture will be explained to developers at WWDC, and App Intents are the integration layer. If your app doesn't expose its core actions as intents, it won't be visible to the new Siri.

That's the practical thing to act on before the betas land.

App Intents 2.0: The Part You Can Build On

App Intents 2.0 is expected to gain richer entity types, streaming responses, and conversational follow-up support. That last one matters — Siri will be able to ask clarifying questions within your app's action, not just execute a static command.

App Intents give developers a structured way to expose app actions and content to Siri, Spotlight, Shortcuts, widgets, controls, Visual Intelligence, and other system experiences. If you haven't adopted it yet, post-WWDC is the wrong time to start — you'll be behind from day one.

Foundation Models: Multimodal Is the Watch Item

The Foundation Models framework shipped at WWDC 2025 and gave third-party apps Swift access to on-device text generation, structured output, and tool calling. The question for tomorrow is whether vision input opens up.

Whether Apple's on-device Foundation Models framework gains image input for third-party apps is one of the two things that will actually change developer roadmaps this year. If it does, it would turn the 1–2GB vision models many apps bundle by hand into a system API.

A new Apple developer subdomain for generative AI is reportedly going live alongside the keynote — which suggests something substantive is landing, not just an incremental update to existing APIs.

SiriKit Is Getting Deprecated — Start Migrating

A SiriKit deprecation notice is expected at WWDC 2026. Apple rarely kills APIs immediately, but a deprecation notice means you have 2–3 years before apps using the older framework stop working. Begin the migration to App Intents if you haven't already.

This is the quiet announcement that bites teams who ignore it for 18 months. Note the timeline now and put the migration on the roadmap.

Xcode and Swift Updates

Swift 7 and Xcode 18 are expected — improved concurrency, better AI coding integration in the IDE.

Xcode's MCP support shipped earlier this year and already lets Claude Code and Codex agents explore your project, scaffold features, and visually verify SwiftUI layouts via Preview screenshots. Xcode 18 is expected to deepen that — closing the feedback loop that makes agentic coding practical for real interface work, not just backend logic.

iOS 27 SDK: Foldable APIs Without the Hardware

One thing worth noting for teams thinking ahead: the iPhone Fold won't debut at WWDC, but the iOS 27 SDK is expected to ship foldable-aware APIs developers will need before the hardware lands in September.

If you want your app ready for launch day on Apple's first foldable, the SDK tomorrow is where that work starts.

Liquid Glass Cleanup

macOS 27 is expected to fix the Liquid Glass shadow and transparency quirks that made text difficult to read in macOS 26 Tahoe. A system-wide slider for adjusting Liquid Glass effects across iOS 27 — originally planned for iOS 26 but cut — is also expected to ship this year, applying to app folders, home screen elements, and navigation bars.

Worth testing your UI against once the beta lands. User-adjustable transparency means your interface needs to look right at multiple opacity levels, not just the default.

What to Watch at 10am PT Tomorrow

In rough order of developer impact:

• App Intents 2.0 details — new entity types, streaming, conversational follow-up
• Foundation Models multimodal — does vision input open for third-party apps?
• SiriKit deprecation notice — confirm the timeline
• Gemini Siri privacy architecture — which queries stay on-device, which route to Google
• Xcode 18 agent features — what the new AI coding integration actually looks like
• Foldable-aware APIs — first look at adaptive layout support

Betas drop right after the keynote. The 100+ session videos run through Friday — that's where the implementation details live. Watch the keynote for direction; watch the sessions for the actual API changes.

Sources: MacRumors, AppleInsider, ASO World