Just to note, WordPress uses x.y.0 for major releases, so this is no more of a major release than 3.9 or 4.1. It's an awesome release, but don't think of it as

Just to note, WordPress uses x.y.0 for major releases, so this is no more of a major release than 3.9 or 4.1. It's an awesome release, but don't think of it as "major version 4". :) Congratulations to the contributors on a fantastic release.