Softer tyres

[Gerard]

Next year Michelin will enter the formula one world in a bid to compete with Bridgestone.
The issue has sparked fears that the tyres would become softer in turn resulting in understeer.
There's also the possibility Bridgestone will provide softer tyres to some teams this year already in order to have an advantage on Michelin when the next season begins.
McLaren's managing director Martin Whitmarsh has said the new MP4-15 is designed to cope with increasing understeer.
He explained by saying: "Understeer is a more prominent feature with soft tyres, and our car will reflect that."
I have two questions.
What will be left of the grooves of a soft tyre after the race?
And could it be possible McLaren is looking ahead already and therefore designed a car which can cope with understeer?