We talked about Advanced info and Gadgets apps that Microsoft has shipped on Lumia 950 and Lumia 950 XL. Advanced info replaces Extra & Info while Gadgets app replaces Device Hub. Now, while these two updates are yet to arrive on Insider devices running Windows 10 Mobile, you can download and install these two easily yourself.
For getting Advanced Info, click here, go to store and get it. Though Advanced info and Extras & Info both exist now on my device after installing it.
For Gadgets app, click here to download the Appx on your device. Now go to Settings and put the device in developer mode. Once the app is downloaded go to file explorer and tap on the file. Choose install on getting prompted and you will soon get a notification in action center that Gadgets has been installed. The app appears in the Apps list.