All that said, don't throw your current iPod touch away just yet. Besides the obvious veracity issues here (Photoshop is a powerful drug), we've seen prototypes before that never actually made it to production. In the shot above, you can see "Apple c 2010" (on the little tag off of the case), and in the other picture posted, there's a date stamp that says "10-04-29," so either the design or production of this thing is from much earlier this year (before Facetime was ever announced). And don't forget that there have been other rumors as well -- just because one prototype of the iPod touch has a Facetime camera doesn't mean we'll ever see that (or even only that) go into production.
But it's an interesting shot of course, and the evidence is building that we'll see some form of Facetime implemented in Apple's other devices.