On October 21st Microsoft updates the Windows 10 Technical Preview and here is how you can too. This update adds a few new features such as a Notification Center, Battery Saver, and DataSense (All features from Windows Phone originally but welcomed in Windows). I had read that you could update to the newest build, Build 9860, through Windows Update but after trying to make that happen with Windows Update through the Control Panel I went to Update and Recovery and then Preview Builds in PC Settings from there you can invoke a check for new builds of the Windows 10 Technical Preview.
Once it finds the new build click on Download Now. It will take some time and there is no progress bar so just sit tight till it prompts you to restart your computer. The setup will begin and will restart your computer a few times. Once the setup is completed you will be running Windows 10 Technical Preview Build 9860. I suggest backing up your data first before doing this upgrade just in case. Build 9860 also adds a few feature here that allows you to get preview builds more rapidly. Please keep in mind that means there may be more bugs as they have not been tested as much but you can change this setting at any time.
There is one other note, after installing Build 9860 you may notice some text missing from PC Settings or from web pages, There is a Windows Update that will fix this you will want to install afterwards. Enjoy seeing the new things in the updated Windows 10 Technical Preview. Keep in mind there may be bugs in this build but I am excited to see how Windows changes.