With the success of the Galaxy SII, it would boggle my mind if Sprint released what basically amounts to an Infuse. However, when you compare the pictures of the Infuse to the leaked photo, some of the small things are definitely similar. The speaker holes are on the same side as the Infuse (opposite side of the SGS2) and the divot in the volume rocker looks more like the one on the Infuse (the SGS2 rocker is flat). Also even though it's tough to tell, I would say the battery cover does look more like the one on the Infuse than the SGS2.
If this is the "full touch 4G device from Samsung" hinted at in Sprint's Q3 Roadmap, I think a lot of people are going to be pretty disappointed unless it matches the specs of the Galaxy SII.