You can find pics of the can at Bevnet.
I was reading an article about it on that site. According to them it will only be available in areas where Pepsi does the bottling for Dr Pepper. If you live in an area where Dr Pepper does it's own bottling or someone other than a Pepsi bottler does it, you wont be able to fine Heritage DP.
On a side note, what do you care? Isn't cane sugar DP all over Texas already? Last I was down there I could find it almost everywhere.