Okay. Remember the X100 before the second firmware update? It had no "corrected AF frame" at all. When it did, we learned that even at its most extreme, the parallax adjustment was slight, the worst-case brackets mostly overlapping the immovable focus box. And, if you remember, the "corrected AF frame," when it did come down in a firmware update, defaulted to off. That is because in the wider variety of shooting situations the difference was so slight as to make no difference. But throughout there has been a fairly accurate focusing box that can be moved around (though focus-recompose is easier than moving the box around if you're not using a tripod). No, it is not corrected for parallax. And I maintain that the front window of the viewfinder is close enough to the lens that parallax will never be much if any issue except for pictures taken very close up, in which case the camera turns on the LCD anyway. But that's beside the point.
What the X20 lacks is that initial, fixed box. The important scientific observation that Fuji has used up all the colors available to the LCD is risible. And the absence of the box -- not a grid, not a fluffy bunny scene mode, just a plain box of the sort you get when turning on the X100, is in my estimation a terrible flaw. Not as bad as the inability to configure the LCD to behave as one wants, but terrible still. When you get your hands on an X20, look through the viewfinder, then look through an X100 viewfinder, and see how bad the X20's nothing-before-a-half-press "information display" is. And for no reason.