Apparel and footwear giant Nike Inc. (NYSE:NKE)  could show further progress in its turnaround efforts when it reports second-quarter financial results Thursday after market close.Here are the earnings estimates, what analysts are saying and key items to watch.Earnings Estimates: Analysts expect Nike to report second-quarter revenue of $12.22 billion, down from$12.35 billion in last year's second quarter, according to data from Benzinga Pro.The company has beaten analyst revenue estimates in four consecuti ...