The pathfinding tools are starting to find their way into TPVs well ahead of showing any sign of moving from the SL Beta Viewer to the release version.
The delay in updating the release viewer may be down to several reasons. One of these might be that Linden Lab staff acknowledge the pathfinding documentation is currently undergoing update and rationalisation, and so the capability is still regarded as being “in beta”.
The table below is a list of current TPV versions (August 19th) of TPVs which have started to embrace pathfinding, and indicates the tools provided.
Note that the Navmesh View / Test option is tied to the new SL Havok sub-licence arrangement, as such none of the above viewers are able to include it unless / until they sign the sub-licence agreement (and are eligible to do so). However, visualising the navmesh is not essential to setting pathfinding attributes for objects in-world or optimising regions where pathfinding is being actively used. Other “missing” functionality as indicated in the table above will doubtless be addressed by the viewers in future releases.
Links for these viewers, including to their release notes, can be found on my Viewer round-up page.