The temptation with 'sporting' models is to make the suspension rock hard to aid cornering etc. However, with the Up GT, I hope they don't go down this route (at least not too far). Add larger wheels perhaps but keep the ride comfort - I think the standard set up could take the extra performance.
As the review points out, with the addition of the turbo, the Up GT would be a nice long distance car; the low down torque would make for effortless cruising with less gear changes.