Mike Mozart/flickrMcDonald's is making changes to its coffee line in hopes of chipping away at Starbucks' coffee empire. The company first launched its coffee brand, McCafe, eight years ago, and it now generates about $4 billion annually, or about 16% of sales per year. Next year it's relaunching the brand by upgrading its espresso machines and kicking off a marketing campaign that will highlight its competitive prices, Bloomberg reports.