This is another Autocar story thats not actually true, reminds me of the one when they said BMW were planning to put the 120D engine in the MINI...
In this case VAG internal rules means the 2.0 TDI can't go in anything smaller than a Golf, so the biggest diesel available for the Polo is the 1.6 TDI, and thats only 105bhp, so hardly worthy of the GTD moniker.
The Polo GTI info on the other hand is completely true, as it wil indeed feuture the twicharged 1.4 TSI as found in the Seat Ibiza cupra.