I have a Lumia 1520 and what I would love is the camera hump to be flush, even if that means making the device thicker, which would allow space for a larger battery. I would like to have a USB 3.0, along with a speaker mounted on the bottom, or have two mode speakers through the front in the ear-speaker. I also would like the micro SD, and sim tray to not rattle, but still on the right side. I think they should get rid of 'double tap to wake' and just keep the windows button's sensitivity on to wake the phone, similar to the surface's windows button on the front of the display. Other than that I love how the camera, charging/sync port, flash, and headphone jack are all centered on the phone. Unlike the HTC one m8. And the iPhone. I love everything centered, and clean. All I really want is multi-window mode. I love everything about my Lumia 1520 hardware wise.