A NEX-6 with a built-in flash that can act as a wireless flash trigger. I don't understand why this is so hard for Sony to grasp.
"How often do you really need to record files to two different cards, for example?"
The biggest benefits of having two SD card slots is having one card act as overflow and/or having one card being the primary still card with the other as the primary video card. Better file management and cheaper alternative to high-capacity cards.