Digging the MVVM Framework world, I found out that Catel - application development platform with MVVM support (WPF, SL, WP, WinRT) includes an extension so we can use CSLA business classes as the Model property of a Catel's ViewModel. In fact this extension has its own ViewModelBase (that inherits from Csla.Xaml.ViewModel<T>) to make CSLA / Catel integration easier.
These aren't exactly "breaking news" as the first NuGet publish of pre-release Catel.Extensions.CSLA dates September 20, 2012
The thread http://catel.codeplex.com/discussions/355130 is where it all begun and it contains a lot of useful information.
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