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I'm just waiting on Delayed Job at this point :)

DJ could use a update to be fully Rails 4.2 compatible. I'd love a PR for that and would merge.

The repo you linked to is dead. DJ is in active development at https://github.com/collectiveidea/delayed_job.

What do you mean? Is DJ supposed to become a Rails built-in library?

No, but Rails has ActiveJob[1] which allows you to use backends interchangeably (see heading 4.1 of the link I posted).