The past week has seen a lot of news for coffee companies Starbucks (SBUX 0.11%) and Green Mountain Coffee Roasters (GMCR.DL). Investors in these two stocks experienced large gains because of optimistic earnings from Starbucks and a new partnership between Green Mountain and Costco Wholesale (COST 0.33%). The single-serve segment, however, is facing increasing competitive pressures, and over the next few years, investors will need to pay attention as the storyline plays out. Watch the following video as David Williamson and Blake Bos go over this past week's events.