The Ignite Book of News give an overview of each announcement and has links to find more details about each announcement:

However you may like to bookmark this page and work your way through the blogs that attracted my attention, focused on Office, Teams, Viva, Collaboration, Security & Compliance.

Office 365, Teams & Collaboration

Modern Work (SharePoint, OneDrive, Lists, Teams,

Microsoft Lists Announcements:

Office Mobile:

PowerPoint Recording Studio:

Microsoft Editor:

Clipchamp becoming part of Office 365:

Mesh for Microsoft Teams:

Microsoft Loop: (Loop components were previously announced as Fluid Components)

File Experiences:

Teams Connect (Shared Channels): Shared Channels allow you to work across organizations in Microsoft Teams channels, WITHOUT switching organisation. Now due Public Preview early 2022. Register to hear when the preview is available: Introducing Microsoft Teams Connect

Microsoft Planner and Project: a look at what’s to come:

Hyper Connections – collaborative apps across Microsoft dynamics 365, power platform, office and teams

Microsoft Forms Collections. Though this was announced back in September is it now rolling out:

Microsoft Viva

Viva Topics:
New Viva Insights capabilities help foster wellbeing and productivity across a hybrid work culture:

Viva Learning now generally available:
Deploy Microsoft Viva with ease across your organization:

Announcing new Microsoft Viva partner integrations:

Microsoft Viva Suite Subscription: Microsoft Viva is now generally available to help transform your hybrid work experience – Microsoft 365 Blog

Stream migration from classic to new Stream built on SharePoint is now in preview (no blog yet)

Power Platform enhancements including more integration with Teams and a PowerApps Pay-As-You-Go subscription plan New Power Platform capabilities announced at Microsoft Ignite – Microsoft Power Platform Blog

Security & Compliance

Security & Compliance (there a lots of links to details of the announcements in this article):

Extending Compliance, Risk & Privacy Platforms:

Microsoft Information Protection: Enhanced Automatic Classification Capabilities:

Threat and vulnerability management support for Android and iOS:

Document Version Insights with Microsoft Advanced eDiscovery:

Insider Risk Management Enhancements:

App Governance:

Microsoft Compliance Manager: extensibility beyond Microsoft 365:

Microsoft Endpoint Data Loss Prevention for macOS:

Expanded DLP coverage:

Warn and Educate Users on Risky App Usage:

Microsoft Defender for Cloud Apps:

Microsoft Defender for IoT: How Microsoft Defender for IoT can secure your IoT devices – Microsoft Security Blog

Microsoft Information Governance: New Ways to Govern Your Data in Microsoft Teams:

Microsoft Sentinel introduces enhancements in machine learning and productivity

Protect your business with Microsoft Security’s comprehensive protection: Protect your business with Microsoft Security’s comprehensive protection – Microsoft Security Blog