It was supposed to be in August, many of us are waiting for it. But we still need some patience.
Some of us wondered if it will come back again.
Firstlook:Windlight is coming back!!!
I read this article in the updates from Torley Linden:
"Hopefully in a few weeks. I earlier hoped it would come out by the end of August, but it doesn't look like we'll hit that. The WindLight Team has been very busy fixing bugs (including those I've reported), and today, we just launched an internal testing round for Lindens (because previously, it was mainly just the WindLight Team using it). I apologize for the delay because I know how anxious a lot of you are, particularly from comments I've been getting on my snapshots.
Also for emphasis, you should know (if you don't already) that WindLight isn't just about "pretty skies" — performance improvements, rendering optimizations, and code cleanup to improve the viewer are an important part of it too. It's a false dichotomy that we spar between bug fixes vs. new features, and I am dogged (and obsessed) about improved performance & stability (aka P&S) for Second Life."