I initially said my traffic losses were -40%, but now I'm heading out into -60%+ territory as the full update day begins.
Looking at the serps this morning I'm seeing some of the initial junk disappearing, with corporate brands filling in the voids. All of my major and minor keyword niches now look relatively the same, with Wikipedia occupying the #1 spot and large corporate brands taking the remaining first page results.
This appears to be a complete corporate brand takeover of Google's first page results, with Wikipedia leading the charge. At this rate I give the search world 5 years before a total corporate driven lockout goes into affect, meaning search traffic will be dead to small publishers. The last bastion of traffic left will be direct domain based type-ins, however I'm sure Google will be able to custom tailor Chrome to solve that problem as well.
The internet just became television.