[White flag man]

Originally Posted by phoenix

Yes, but the old circuit will include the new Sear hairpin, not the old Sear.

The new small loop can be used on it's own at the same time because there is a (left-handed) hairpin link at the beginning of turn 8 back onto the straight between turn 2 (Sear) and turn 3.

The Autosport map http://www.autosport.com/news/report.php/id/86893
shows this best. If you look closely, the links which will be used are shown in a milky-white colour, and the sections of track which will no longer be used have dashed edges and are in the same green as the background colour.

Well spotted Phoenix,
my apologies to Westfieldbend.