I was reading Martin Fowler's articles http://martinfowler.com/articles/feature-toggles.html and found this approach interesting..

Feature flags have been around for awhile on very large websites.

But with all the current emphasis on continuous delivery they're becoming well known everywhere.

i think they're hitting their hockey stick of adoption. it's been a necessary component for continuous delivery at high scale for a while, but it hasn't always been this easy.