BlackBerry's superior physical keyboard was what made its name. The Android-powered Priv's QWERTY keyboard slides out.
With a 5.5-inch screen, the Priv is already a hulking jumbo phone. When fully extended, it'll be quite the handful.
Despite including a keyboard, the Priv looks fairly slim.
This image from an early BlackBerry campaign doesn't reveal much, but you can see the screen curve on both edges.