There's a rumor saying that in Q4 2015, both retina MacBook pro and non-retina MacBook pro will be discontinued. At the same time, new 13 and 15 inch MacBooks join the MacBook lineup. They will use the same design that comes with the 12 inch MacBook. The size and weight of the 13 and 15 inch resemble the current MacBook Air. The MacBook Air lineup will be retained as the entry level machines with non-retina displays. Not sure if it is true or not. Let's wait and see.