Something's changed in Laravel 5.2 Session?

I was using laravel 5.1 and used to have a session route for checking sessions

$router->get('session', function()
{
    return dd(Session::all());
});

Which allways returned at least an array of 3:

array:3 [▼
  "_token" => "3hSm8uzRVrZNxCgBJLflsnyr6LT6zPsPc22mODhi"
  "_previous" => array:1 [▶]
  "flash" => array:2 [▶]
]

Now in laravel 5.2 the same route returns a null array and sessions are not working in a new fresh installation of 5.2.*