I'm looking at upgrading my sites to 4.0, but I don't know if that's a major update.
Most of the sites I maintain are on 3.9, and I don't know if I should wait for a 3.10 release. Most of the open source software I use uses a numbering scheme of {major}.{minor}.{patch}
and I'm wondering if WordPress 4.0 is a minor or major update, since the dashboard is prompting me to update to 4.0, not simply look into it.