Windows 10 Insiders on both PC and mobile platforms should be receiving Preview Build 14328 today. Microsoft calls this a "major" build that brings quite a few new things to the OS. Some of the new features discussed at Build 2016 are now included, like the Windows Ink Workspace. Using an active pen, users can draw on a whiteboard, create sticky notes, and mark up digital maps and websites.
There are also refinements coming to tablet mode. The full-screen All Apps menu (à la Windows 8) is back as an option. The lock screen now hides your e-mail address, and it can display media controls in case you use your Windows device as a media player. Cortana can operate on the lock screen as well, although for anything beyond simple queries you'll have to unlock your device.
Microsoft's digital assistant is getting a number of other updates, too. Those cross-device features that Microsoft promised should actually work now. Cortana can also create reminders from UWP apps, or from photos you add to the photo app. Reminders you create will show up on the taskbar clock's calendar, as it is now fully integrated with the calendar app and Cortana.
Speaking of the taskbar, gamers with multiple monitors can rejoice, as you can actually have a clock on every taskbar now. The Action Center icon has moved edgeward, and now will be separated from the rest of the notification area by the clock. The action center itself is getting some updates, as well. The biggest of these is notification grouping by app. The Wi-Fi icon will now bring you to the "View Available Networks" menu rather than simply showing Wi-Fi status.
Aside from the new features, there are various fixes and issues, as we'd expect from a preview update. These changes and more should hit the Windows 10 mainstream in the Anniversary Update codenamed "Redstone," but Microsoft has given no timetable for when that will happen aside from "this summer."