Put the summary of the bug you're having here

What I expected to happen was...:
The new launcher works

What actually happened was...:
System level dialogue appears reporting "This application requires the legacy Java SE 6 runtime which is unavailable for this version of OS X."

Steps to Reproduce:
1. Launch Minecraft on 10.11

Notes
According the the release notes from Apple at https://developer.apple.com/library/prerelease/mac/releasenotes/General/rn-osx-10.11/ :
OS X El Capitan is the last major release of OS X that will support the previously deprecated Java 6 runtime and tools provided by Apple. Applications or features that depend upon Java 6 may not function properly or will not launch when Java 6 is removed. Developers should move to a newer version of Java as provided by Oracle. For more info on Java from Oracle: http://www.oracle.com/technetwork/java/javase/overview/.