I know of two routes on the king wall that are not in the guide book. One is a variation finish to Kingdom Come pitch one. I haven't climbed it, but it is atleast mid 5.11 because you have to climb through the crux of Kingdom. The other route is to the left some and is an aid route. There is a description in the new route book at the mountaineer. I agree that any routes done in the future at the King Wall will be quite hard. In general there hasn't been that much new route activity at the cliffs documented in the guide, during the past few years. Seems like most of the obvious lines have been done.
Kevin