I think this announcement has actually made me more excited for Season Three than most previous announcements.
Also, after watching "It's About Time", I've determined that future Twilight came to warn present Twilight about Chrysalis. In that time, Chrysalis escaped from Tartarus when Cerberus ran away and put her plan into action earlier than before, causing a different crCIA.
After future Twilight attempted to warn present Twilight, this altered time because Twilight's constant worrying brought her attention to Cerberus' escape, thus bringing him back to Tartarus before anyone escaped. Chrysalis escaped later on though, the plan went into action, she failed. /new head canon joke