It's all speculation particularly when dealing with VW but the current Tiguan is slated for replacement in 2015 and VWoA has said they would like to have a TDI version.
I wouldn't get too excited since they talked about a second N. American plant for the better part of 10 years before they approved the TN plant. They have a slow, indecisive decision making process between the German and US divisions (mostly German) and would not be surprised to see a diesel debut on the 2021 Tiguan instead.



