(I hate when I have to say "In interveiw I had with K.Y....), but...
In interview I had with K.Y. in September 2003., he stated that both Le Mans and Nurbergring Nordscleife (and we are talking Nordschlife here, not GP Nurbergring) are tracks that he love and admires, but they won't be in GT4.
Of course, there is always that slight PR issuse which says: don't beleive anything untill you see the final product.
As I can see from things they've done so far with GT4 in terms of drawing and graphic engine, I can say that now I'm not so convinced that Le Mans and Nurbergring Nord are impossible to code in GT4 engine. I can even predict that Le Mans would probably be in, together with Bugatti circuit or some other famous LM circuit, because in GT4 we can expect dozens (and I mean dozens) of LM cars, form the very begginigs of the race to the monsters of the present LM cars. Official Le Mans cars will be the Big Thing of GT4 and Le Mans circuit will probably be the Big Surprise.
And Nurbergring Nord could be one hell of the surprise too, together with Spa and Bathurst circuits, as I keep hearing that from time to time in past year and a half.
Those who look shall see.