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I couldn't find too much info about this. What are advantages (and disadvantages) of Lightworks over other distros like Ubuntu?
I was wondering the same but then I realized this isn't a linux distro - just the linux version of a video editing tool.
It should be noted that LightWorks is a professional grade tool that has been in development for a long time. It has a lot of features that are shared with some pretty expensive high end packages and has innovated several common features that are standard among packages now days.
I would suggest that whilst it can be used for grading, its an editing tool primarily.

Baselight(and davinci resolve) on the other hand is a grading tool, however it can be used as an editor.

I think in this case "professional[-]grade" refers to the quality of the software, not color grading. Isn't English fun?
this was exactly my interpretation. "Lightworks Linux", rather than "Lightworks for Linux".
It's nice to see more and more proffesional desktop apps on Linux.
Free desktop apps I assume you mean - there's a plethora of high-end VFX desktop apps available on Linux.
Nuke, smoke, flame, faire, maya, modo, baselight, resolve are all on linux.

ILM, pixar, Dreamworks, Weta and SPI are all pretty much linux only shops.

Yes, Linux along with the traditional desktop will be the future for the whole creation process, while consumers will shift to other interfaces and devices.
A while ago they announced that they were going to opensource lightworks. Did they change their minds or is it still in the pipeline?
40GBP for a pro license .. but add-on cards for 2000GBP or 4000GBP. http://www.lwks.com/index.php?option=com_virtuemart&Item...

For generic CUDA or something sneaky and incompatible? The software looks good. I might buy it if the card thing isn't what it looks like: a sneaky post-facto wallet-grab.

(Devs: Please - a clear, no-BS explanation on the value proposition and limitations for those of us who don't want to ship a piece of silicon across the world to use the software! Also, approach taken to distro support ... I'm on gentoo. Ta. Best of luck!)

The Addon cards allow you to playout to tape+. Its nothing really to do with cuda, as editing is mostly IO bound (even with some effects)

+yes people still use tape. Everybody can read tape and the colours are going to be correct. Its also really expensive because its a realtime output, you can't have tearing or dropped frames as that will potentially cost you (hundreds)thousands

The card is not a typical "gamer" graphics card. It allows for real-time HD-SDI output and input to and from professional low-compression broadcast formats (Sony HDCAM SR comes to mind). This is closer to BlackMagic's DeckLink 4K Extreme which is actually a better deal at $995 (unless the LightWorks one has some features that the DeckLink doesn't.... Stereoscopic 3D?)
There is an ebuild for it already, although it is in an overlay on github. Probably needs cleaned up but as I don't want to install QT on the laptop I'm using, I haven't looked too much at the ebuild, just noticed a few minor issues with it (no noting that it's a prebuilt binary and to not warn for the QA issues as a result) and not using the unpacker eclass off the top of my head.
Here's a 15 minute video walkthrough from a couple of weeks ago: https://www.youtube.com/watch?v=jEJcPKD9p7A (no affiliation)

Having only used two consumer open-source non-linear editing systems (OpenShot and PiTiVi), Lightworks as one would expect looks a bit overwhelming. More approachable than I would have hoped, though.