Stock index futures are wobbling once again, all down 0.4%, ahead of a big day of earnings from several blue-chip companies. The reports and the outlooks will determine whether recent stock valuations are justified and could provide a forecast of what things will look like for the rest of the year. "The only risk is that expectations across the board are so high, they are going to be very difficult to meet," explained Seema Shah, chief strategist at Principal Global Investors. "We are getting into territory - both with earnings and economic data - where it will be very difficult to have positive surprises."Who is reporting today? Johnson & Johnson is up this morning, and it will likely provide more clarity into its paused vaccine rollout, while defense spending will be in analyzed following results from Lockheed Martin. Other data will provide clues about how the pandemic is still shaping