Learning ActionScipt 2

I have a very basic knowledge of ActionScript based on a couple of books that I have purchased and tutorial that catch my eye. I also have some knowledge of Visual Basic and C++

My questions are:

Do I need to worry about ActionScript 2, do I for example, need an ActionScript book that covers AS 2.

I read somewhere that AS 2 was merely a super set of ActionScript 1 and that the additionality was for high end stuff etc.

Will AS 1 eventually be phased out ?

Is it better to learn AS 2

Thank you