Custom Authentication with Mobile Apps

Hey,

I have a quick question: I'm using the new MOBILE APPS from the Preview Portal and downloaded the .NET-Backend. Now I want to implement custom registration/authentication (without social auth). Is this tutorial from the old MOBILE-SERVICES-Section still a valid reference?

http://azure.microsoft.com/en-us/documentation/articles/mobile-services-dotnet-backend-get-started-custom-authentication/

Or is the approach in Mobile Apps different?

Thanks!