As someone who appreciated the DVD drive because it could be removed and the space/connector used to install a second 2.5" hard drive, I see the removal of the

As someone who appreciated the DVD drive because it could be removed and the space/connector used to install a second 2.5" hard drive, I see the removal of the DVD drive altogether as a negative. This combined with on-board RAM and on-board SSD storage... are any of the components in these new retina display MacBook Pros replaceable?