High expectations for U.S. automakers' new models... GM, its stock price at its lowest level in a generation, the sales pitch that it makes in the coming days will be fraught with risk and high expectations. After the shock of last year's record-high gas prices, the world's biggest automaker was forced to retool its product lineup of trucks and SUVs, belatedly recognizing that many consumers are leaning toward smaller vehicles. With its stock in the tank and its sales showing no sign of turning around, GM will try to breathe life into the ailing SUV segment with its hotly-anticipated GMT900...