Actually, it's a variation on an old trick. When I'm at my desk working, Charlie will sometimes roll over and look all cute - his way of saying, time to pet me! Except about a year ago he would do this, and then as soon as I got up, he would race off to get a toy and get me to play with him.
Now he has started doing the same thing with wanting to being let out! He will go to the sliding glass door of my apartment, and stand there pawing the glass like he usually does when he needs to use his toilet (in his case a large section of newspapers spread out on my balcony outside). Now he goes to the door, acts like he wants to go out, and as soon as I'm half-way across the room to let him out, he rushed off to grab a toy and runs up to me with his best I'm the cutest dog in the world expression! I must admit his ploy usually works.