I would call to make sure. I did my reservation online. I kept waiting and waiting for my ME vouchers. so I called Disney reservations. They gave me the # for ME, and I called (this was just 2 or 3 days ago). I couldn't really hear, I was in the car and pulling in to work. I think she said that they hadn't received my info from Disney reservations. So I had to call back, because I didn't have the flight # handy. But, they were really nice and I got it all straightened and he said they (ME vouchers) would arrive in 7-10 days.
So my advice is to call and make sure everything is a-okay. When I would go to check my reservation online, it had my flight info on there, so I don't really know why ME didn't have it.