Like IFTTT, Flow simplifies workflows by connecting different apps and internet services. For heavy Windows users and those who rely on Microsoft's Power BI business insights tool, the integrations on Flow go even deeper with Office 365 and Dynamics 365. But you don't need to be a 100% Windows user to take advantage -- there are already iOS and Android versions available so you can manage and monitor all your Flows from your mobile device.
As for tomorrow's other public release: PowerApps is also aimed at "power users" who either don't have the time or the background to get their hands dirty writing code. The app allows users to quickly build web and mobile apps with zero coding and ties in with Microsoft's Common Data Service to keep your data hosted on your own secure Azure database.
Both apps are now included as part of Dynamics 365 as well as Office 365 Enterprise, Business Premium and Essentials subscriptions.