A photo that recently hit the Internet showed a box with an iPhone that read, "The New iPhone." Right away, it spread like any other Apple rumor and has people speculating, but no one can confirm the validity of the photo.
Probability: I'm not counting on a name change at this point. While it's possible, and I could be eating my words in a few days, I am going to have to go with a "no". Apple's press invitation clearly features a '5' on the image, and says "It's almost here." Both of these details imply that "it" is the iPhone 5.
On the other hand, the image above does make a good case that Apple will do what it did with the most recent iPad and announce "The New iPhone - 5th Generation".
(Credit: Dutch iPhone blog.)