This is a visual designer for iOS apps that will allow developers to see design changes as they make them (and as they will look).
This is a library that allows developers to use a single C# code base to build native UIs for Android, iOS, and Windows Phone apps.
3. IDE Enhancements
A few enhancements improve IDEs working with Xamarin:
- Xamarin Studio visual updates
- Streamlined Visual Studio extensions
- NuGet support in Xamarin Studio and Visual Studio
- F# support in Xamarin Studio
- .NET BCL Documentation in Xamarin Studio
Shared projects and portable class libraries aim to maximize code reuse.
Check out the full announcement for more details.