hhdivil

http://www.giantbomb.com/api/games?api_key=REMOVED&format=json&filter=original_release_date:1700-01-01+00%3A00%3A00|2013-11-13+00%3A00%3A00&sort=original_release_date:desc&limit=10

This does it, seems you have to add the current date in as the end date. I tried running it up to 2013-12-31 but it started returning unreleased games.

If you are using PHP don't forget you need to use urlencode() on the dates or it won't work - e.g:

$filter = urlencode('1700-01-01 00:00:00') . '|' . urlencode(date("Y-m-d 00:00:00"));