Xamarin Forms 2.0 intellisense issue with VS 2015 update 1

I'm having issues with Xamarin Forms 2.0 and VS 2015 Update1 with Resharper: New properties like CachingStrategy are not recognized and also types exposed by a PCL references by Form's project PCL too (sometimes recompiling the project fixed it)
At runtime everything works but not having Intellisense is a mess, any hint?