“This Is Us” Season 2 seemed like it was going to end on a happy note — until those flash forwards assured viewers that more drama was to come. Now, fans are anxious to see what’s in store for Season 3. Luckily, the executive producers have let a few spoilers slip.1. Birthday Beginnings — “This Is Us” Season 3 will once again kick off with the birthdays. The show will jump forward a