I first thought they were using a different course to avoid the climbing esses, which would be a shame, but taking away the full back stretch to add a run through the auto cross infield course is a shame. Perhaps they are concerned about the speeds at the end of the back stretch???
To make the infield a little more interesting, perhaps they could throw in a dirt section and a couple of jumps.
I do like Pumpelly's comments.
Oh well, one of the great American circuits; glad to see them heading there, and there is still plenty of time for all of us to gripe and moan until race day. Maybe they'll listen.