With Turtle Rock Studios not working on Evolve anymore, apparently they got bored and when back into the vault to dig out an unfinished level from Left 4 Dead. And then they decided to release it to the public, for that, we appreciate it.
Sources:
http://www.eurogamer.net/articles/2016-11-07-call-of-duty-infinite-warfare-launch-sales-down-nearly-50-percent-on-black-ops-3
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