UP FOR DISCUSSION: - GM CEO Mary Barra gets grilled in front of the U.S. Senate... Again. - Are B-segment CUVs and luxury cars set to boom? - VW announces its CrossBlue SUV will be built in Chattanooga, Tennessee. All that and much more with Gary Vasilash, Automotive Design and Production; Keith Naughton, Bloomberg; Michael Robinet, IHS; Bill Visnic, Edmunds.com.