I find that combining the Williams guidebooks with the Comments on MountainProject.com works just fine for me.

I don't see any need for a new guidebook -- for figuring out what and how to climb things in the Gunks.

The problem is that the format and color of the Williams guidebooks is old-fashioned and uninviting, and the distribution availabity is not very good -- so that leaves the door open to new entries.

Ken