They have been renamed "Contextual filters," and they have been moved in the third column that, by default, is collapsed by default.

  ![screenshot][1]

In Drupal 6 (Views 6.x-3.x-dev) the URL arguments are still called "Arguments."

  ![screenshot][2]


  [1]: https://i.sstatic.net/W3OpA.png
  [2]: https://i.sstatic.net/79DF4.png