I came across this recently. I believe this was open to Lexus employees but in 2015 I understand it will be open to consumers. My understanding is that you follow the lead car around the track (RC). For the NX, it seems like they went on back roads (around 50 seconds in. There are other video links if you visit the other articles. Seems like a good way to drive the NX if the dealer doesn't have any (and RC). Anyone hear about this and would you be interested?
http://runningofthebulls.lexuslearn.com/on-the-run/
http://runningofthebulls.lexuslearn.com/on-the-run/