ABC News reports that President Obama was presented with three options on Afghanistan by his military commanders and that sending an additional 40,000 troops -- which was recommended by Gen. Stanley McChrystal -- is described the "middle option."
The Wall Street Journal reports a more extreme possibility is sending an additional 60,000 troops. The third option, described by his advisers as "high risk," was sending no additional forces.
It's probably safe to assume this was leaked to prepare the American public for sending additional troops and show the president as taking the middle ground.