So in March, Upload VR reported this: New Linden Lab Video Promises Sansar Open Beta this Spring.
But earlier this month, the Irish Times reported this:
Sansar goes into open alpha in summer 2017, allowing anyone with a VR headset to sign up and try it out
Now a difference between Spring and Summer is just 2-3 months, so that's not much of a delay. But a difference between Alpha and Beta suggests Sansar is still in a very early stage of development. At that rate, we may not see an official post-Beta release until the holiday season or even 2018. This would explain why Linden Lab is even now looking for someone to help create a voxel-based terrain editor for Sansar. My first thought at that help wanted ad was, "Cool!" Followed by, "Um, shouldn't you have hired someone to build that maybe 2 years ago?"