[pscarey]

With hot code pushing, you're deploying newly written code/functionality, post release (opening possibility of up MiTM attacks etc).

With Remote Config you deploy the code, then decide what to show to users post release. This gives Apple a chance to review all the code submitted to the App Store.

In the case of rolling out features an A/B tests, you'd make a release including a feature, but only enable it x% of your users using RC. You can then obviously enable it for everyone if it passes your A/B test or if you're happy its working.