This fall and winter, DDOT has hosted a couple of meetings on the Klingle Valley Trail. In Novemeber they had a Context Sensitive Design/Context Sensitive Solutions stakeholder meeting, wherein the goal was to gain input on five different design details that will define the character of the trail. Those items were the lighting, furniture, fencing, signage and boardwalk.
For lighting they're considering pole and/or bollard lighting, employing energy efficient lighting technology. While solar lighting was considered, the shade caused by trees and the difficulty DDOT is having keeping the Met Branch Trail lights working (they're suing the contractor over them) probably doomed them.
For furniture, they are considering how many benches to install, where to put them and what to make them out of.
Fence considereations are bicycle safety and appearance. The pictures shown are of wooden fences. Signage seems pretty self-explanatory (sorry, no trail mushrooms).
FOr boardwalks they're looking at timber with timber rails, a through truss bridge and precast concrete bridges.
You can see images of most of these items at the link.
According to the meeting minutes, participants did not like the precast concrete bridges for this trail, but were worried about the truss bridge's appearance and the timber bridge's maintenance needs. They also supported trail kiosks at both ends of the trail.
In addition to the trail, the project will include a restoration of the creek itself. Not really bike relevant and a bit over my head, but here is the link to that report if you're interested.
Here also is the 65% design plans. They are pretty wonky (you can see what the silt fence design will look like - that's going to lead to a big comment section fight), but on page 30 you can see the short section of boardwalk they're planning. And remember, these designs are NOT for construction, so don't get any ideas.