I too was disappointed to see that the D3200 does not include Bracketing. My daughter is ready to go from P&S to dSLR and that feature for a novice would have to be seen as virtually indispensable for getting better shots while moving along the learning curve for using lighting effectively.
It is clearly a really nice entry level camera, but Nikon decided to keep Bracketing out, probably for the sole reason of maintaining that function as a demarcation between the D3000 series and the D5000 (and higher) series. It would have added virtually nothing to their cost of producing the camera so the only other explanation for its not being included would have to be - "we forgot".
So, unfortunately, I doubt that they will add it in later. Hope I'm wrong.