For this first CTP of NuGet 3.0, we’re only updating the extensions for Visual Studio 2013 and Visual Studio “14”. We’re not releasing an update for Visual Studio 2010 or Visual Studio 2012 at this time. We have always had a single extension that targets both of those versions, whereas we have separate extension for Visual Studio 2013 and Visual Studio “14”. NuGet 3.0 is now using some libraries that require .NET 4.5, and that would rule out updates for Visual Studio 2010.
Whether or not subsequent releases for NuGet 3.0 will target Visual Studio 2010 is still undecided, but we’re strongly leaning toward cutting Visual Studio 2010 from the release. If we do make that decision, we’ll remove Visual Studio 2010 support from the Visual Studio 2010/2012 extension, making it Visual Studio 2012 only. We’d then provide support for Visual Studio 2012, Visual Studio 2013, and Visual Studio “14”.