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Specific comment:

http://www.reddit.com/r/gamedev/comments/224ntd/unreal_engin...

They already are accepting pull requests - several have appeared in hotfixes. There's a link to some of the pull requests in that blog post, although I'm not certain you can access them unless you've paid the subscription and setup your github account link. There are a few really quite cool pull requests being reviewed just now too.

"We'd like to support the editor on Linux some day" is not "editor support is planned for the future."

Eh? Isn't the github repo for the engine source only? AFAIK the editor would still be closed source.

The github repo contains the entire engine and editor source. The only thing not included there is closed console support, which you have to ask for just to ensure NDAs are in place. So, yes, you could in fact port it over to Linux.