I actually didn't get that vibe from Emrakul. It's not like it has a big ol' plan. Jace's brain interpreted whatever it was feeling as Emeria saying she was "not supposed to be here yet" and that's why the spell was warped somehow. I got a vibe that was more like, "Wait, this apple isn't actually ripe yet" after having taken a bite than "HAHA THAT WAS MY MASTER PLAN."
Hour of Devastation Trailer