Officially unveiled at the Geneva Motor Show on Tuesday, the third generation Audi TT is, visually at least, a gentle evolution of the outgoing model.

However, there are huge changes under the skin.

That's not to say the new car looks identical; it's more angular and masculine especially at the front where the grill is very similar in design to the one found on the range-topping R8 supercar. Yet it's still unmistakably a TT.

Perhaps the cleverest trick is that Audi has managed to increase the car's wheelbase. There's more interior space, yet the company has somehow managed to make the car itself smaller -- it's 20 millimetres shorter and 8 millimetres slimmer.

And thanks to an aluminum chassis, it's 50 kilograms lighter, too.

The new car comes with more power, too, thanks to an improved range of three four-cylinder engines offering outputs of up to 310PS, a two-litre turbodiesel unit and for the range-topping TTS model, permanent Quattro all-wheel-drive.

Inside, the TT is the first Audi to get the company's much-hyped virtual cockpit, where all main control switches and multimedia functions are combined in a single digital unit.

The TT is expected to go on sale this fall.