Yay! that time of the year again!! 
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Installed it yesterday and wow!, what a jump in performance! Lighttable is very fast now, tagging, browsing etc, all superfast (and I have been asking questions here about the poor performance I was experiencing before, so imagine my surprise).
Congrats to the developer! Now, if only I could put to good use tone equalizer, filmic and the new denoising because apparently tone curves+sharpen+shadow and highlights are a thing of the past…
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Well done to all involved, sounds like an epic update. For us Windows users do you think it will be ported over? If yes, any guestimate on timeframes?
Appreciate your time, thanks all
I’d assume a stable windows release will come out at the same time as other releases. This is a pre-release.
Ahh ok thanks
If you want to help testing:
The Windows build has been provided at the same time as the announce 
Same for MacOS, thanks to our great maintainers
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Thanks darix I will certainly give it a go and report if an problems, thanks
Press coverage starts early this time Darktable 3.0 release candidate arrives with new features, improvements and bug fixes: Digital Photography Review
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A tip of the hat to the developers hard work, Thanks!!
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Interesting which features they highlight and which they overlook …
Is anyone having problems with the Windows build? I installed it on a Windows 10 machine and I’m unable to resize the window of the program and there are some other UI glitches, too.
I`ve just installed the Windows 10 RC and have the same problems. With 2.6.x and 2.7 builds (don’t know the exact build number) everything was working fine. I will try to uninstall the RC and delete all possible leftovers and do a fresh install and eventually file a bug report on github
Just a minor comment about communicating about the pipeline ordering:
From dpreview:
[…] plus support for reordering modules.
The way it is written in dpreview I would wager to say they didn’t get the pixel-pipe part. In any future public release, I would write it “technically” in all places, i.e. something like “The processing pipeline can be reordered by moving modules with Ctrl+Shift+drag.”. I’d expect confusion even then, but with the current wording I am quite sure that there will be lots of confusion around this (people using it as a GUI reordering feature to adjust stuff to their workflow).
Yep. I had no problems using the unofficial 2.7 Windows builds. Thanks for submitting an issue on GitHub.
Huge Kudos to all the devs. Testing on Ubuntu 19.10, the performance improvements in the lighttable are amazing, I typically cull a few thousand shots per session and the change in responsiveness is incredible, feels like 2X to 3X. No issues so far.
Hats off to the culling mode devs, I have been waiting for synchronized pan and zoom for many years and this implementation totally exceeded my old reference point (aftershot, if anyone remembers back when aftershot was a thing).
Not sure if openCL optimizations in 3.0 are part of the improvement but the darktable feels snappier as well.
Wondering if there is any documentation on module subsets and worspaces yet
It seems that overexposed parts of image after export to file using linear prophoto RGB are pink, even when they are white on the screen before export. Is this intended?
So once again I’m still surprised by the speed of everything in this release, also in darkroom mode; switching for example from one photo to the next (shift-arrow) which was previously slow, now it’s instantaneous!
However I do see something strange and want to understand if other people experience the same: it seems like a graphical glitch, occasional flashes on the screen after changing some modules in darkroom mode.
We’ve reworked the internal locking and this could certainly explain that.