It’s on the download page, but there’s no blog post for it yet.
Here’s the links, though only the viewer binaries and FAQ usefully go anywhere.
Mesh blog post | FAQ | Source code
If I had to guess, I’d say the blog post isn’t due for another ten minutes at least. Maybe longer. The mesh-enabled simulators on the beta grid may not be open to users other than the closed-beta participants at this stage.
UPDATE (1 hour later): The Second Life downloads page has had the update removed, though all of the links are still active.
