The Dragon was launched Tuesday. When you search for the spacecraft, you'll see it's current position. As I write this, it's in orbit next to the ISS. Using the augmented-reality feature, you likely can find the Dragon when it is in a good position overhead.
I didn't try to find Dragon in the night sky, but it was easy to find on my iPhone. I could use the search command to find by name, or I could look on the last 30-day launches list. It appears centered on the screen in the correct orientation to the ISS and the star background. You also can get some specifics on the Dragon position and a bit of history. Use AirPlay mirroring and an Apple TV, and you can get it on the big screen, great for teachers or sharing with friends.
I was interested in how the spacecraft was added so quickly to the app, and the developers told me they were contacted by the Space X people and wanted it added. Space X helped with the math and collaborated with Vito Technologies to get the 3D model correctly displayed.
Star Walk is available for US$4.99. Solar Walk is a $2.99. Some screen shots are in the gallery below.