According to this post intellisense should also be working on the new VS 2015, but so far I only get intellisense for the angular object and not for the dependencies or my c
As @Balthasar pointed out (and in case you are using Resharper) you will need to enable intellisense from Visual Studio for it to work:
Resharper -> options -> environment -> intellisense -> general, select 'Custom Intellisense' and for Javascript you can select Visual studio. Alternatively you can use the 'Visual Studio' statement completion (second option)