I seriously doubt Gaara is dead. Remember how we talked back during the "deaths" of Chouji and Neji.
Things doesn't make sense in Naruto as far as death is concerned. Also, if Gaara dies, it will be a damn lot more emotional than it was in this chapter.

Also, during Chiyo's flashback, the photo was obviously showing a grown-up Sasori together with his wife/child.
I am certain that we will find out about a tragedy soon which resulted in the death of Sasori's family and the deformation of his body. Or somesuch.