UA Orders Boeing 777-300ERs / 77Ws w/ 1-2-1 Polaris Business, 3-4-3 Economy
as per Bloomberg
Other than getting a significant discount to keep 777 production until the 777X rolls around, the article notes that the 300ERs could replace other long-haul aircraft. [speculatopn] Perhaps this could be another sign of the end of the 747? [/speculation]