I’ve just upgraded my Raspberry Pi 2 with Windows 10 IoT Core Build Number 10531.0 (download , release notes). It fixes an issue I’ve been having with setting the application the runs when the Pi first starts up. Prior to this release my application would start up the first time and then shutdown and be replaced by the default app. It would then not start up at power up again. Now my application starts up every time I power on my Raspberry Pi 
It is also possible to set the computer name and set the administrator password from the Raspberry Pi administration website. Previously this was done using PowerShell.
In order to navigate to the administration page you must first know either the machine name or ip address of your Raspberry Pi. This can be found in the Windows 10 IoT Core watcher application that runs after you have installed the IoT core SDK. To access the admin website either enter the address into a browser (http://<ipaddressornameofPi>:8080) or right click on the Pi in the IoT Core Watcher application and select “Web Browse Here”. You will need to enter the username Administrator plus your password to access the site.
Here you can enter a new device name (machine name) as well as change the password. A reboot will be required if you change the name.
In order to set the start up app click the Apps link on the menu panel
You will need to ensure that you have first deployed your application to the Raspberry Pi. If you have debugged your application using Visual Studio then a debug version will already have been installed on the Raspberry Pi.
From the Installed Apps drop down select your applications and click the Set Default button. Your application should start and replace the Default App in the running apps list. You can check this by clicking reboot or cycling the power to the Raspberry Pi and your app should start up after the Raspberry Pi has booted.