The 1511 update was released yesterday. It's a big one, and requires that you go through one of those long things where your computer restarts a few times while you stare at a loading ring. Anyway, on to the features.
One new feature is that you can now set the columns of tiles at Start to be eight across instead of six. This allows you to put two wide or large tiles side by side. The context menu for tiles has also been improved; the size selection now shows a preview of how big the tile will be. You can also use more tiles (up to 2048), if you managed to hit the 512 item limit before.
If you missed colorful title bars, you can now enable them. The toggle 'Show color on Start, taskbar, and action center' has been expanded to 'Show color on Start, taskbar, action center, and title bar'. I'd rather it be a separate toggle, but it's there. Only the active window will show color and the Metro style apps will always have pale grey title bars.
Now, when you have two windows side by side you can drag a divider between them to adjust their shared edge. This may be familiar if you had 8 before. I think pics may work better than my description.
That bar in the second pick is caused by a mouse over. And yes, GIMP is probably overkill just for some screenshots.
Context menus now look a bit snazzier as well.
There are supposed to be a ton of Cortana improvements, but it still requires that you convert you local account to a MS account, so I didn't mess with it. You can sign into Cortana separately in the Insider builds, though, so that is coming.
The Enterprise edition now allows users to disable
all data collection. Some of you may find that a worthwhile reason to shell out the cash for the Enterprise edition.
There are also some new system icons. Regedit and the Eject Device icon, for instance.
Other than some general bug fixes, that's pretty much it. This is basically a big patch, so there's not much else to get excited about. You can update to it via the standard Windows Update system. Distributed ISOs are now at this version so if you want to install Win10 on a new system you can get this version directly. If you haven't upgraded from 7 or 8, the Get Windows 10 program should download this version for installation should you decide you want it.