Their defining feature is an OLED display that replaces the old-school depth-of-field scale.
Which is... great? Finding a new way to communicate lens info is admirable because the old way is a little busted. But a display could just be another electronic component to fail, and an extra (very tiny) drain on your camera battery.
The lenses come in 25mm f/2.0 (wide angle) and 85mm f/1.8 (portrait) for $1300 and $1200. UK prices have not yet been announced. Start saving.