Hi ... We booked Disney US about 3years ago .. just took email print with reservation number on,, all was fine no problems at all.. Sounds like your be there about same time as us we arrive on the 20th August, Not Long Now
They gave us an envelope on check in that read as though it should have been sent to us before but they only posted them to a US address (this was 2009)
Just with a dining plan brochure in and coupon for a free game of mini golf etc - nothing crucial.