Wait for the T4i with STM lens deal. Though it is more in cost, but it is a better purchase than getting this one with the standard lens.
Having owned the T4i, 18-135 STM, 40 STM, 18-55 IS II, and 55-250, I concur.
The T4i w/18-135 STM is where your money is best spent for a versatile walkaround kit. The 18-55 may satisfy some but any serious user will want to upgrade and ditch it. I also had the Tamron 17-50 f/2.8. It was my favorite until I got the Canon 17-55 f/2.8. However, I still used the 18-135 STM more often when I had it. Then I upgraded to a 6D and full frame and that's a whole 'nother story. I miss that touch screen (but could do without the articulating).