I think the default is a string now (nvarchar 450). Here's [1] a guide on changing the PK type, but the example uses Guid instead of string. I assume int could be used too, but I wonder if changing to db generated value would cause headaches/show-stoppers.
I belive it uses guid (or a string that stores guid :-/) but it's fairly easy to change it to int. That's what I have in my boilerplate-kickstart template, anyway.
Still I remember I was "surprised" too.
