This one is a relatively small release focusing on balance issues and fixing a few bugs introduced in recent versions. We also addressed some of the longstandingly high-voted mantis issues.
There would be more but we've been working hard on another project (that we might drop some hints on tomorrow, we'll see). Of course it's not another apparatus designed to deliver a "you lose!" experience to players. We'd never do that.
Update: 6.015 hotfix to fix some exo and cloaking bugs in 6.014 that could cause significant problems.
This is a standard update that you can download through the in-game updater itself, if you already have 4.000 or later. When you launch the game, you'll see the notice of the update having been found if you're connected to the Internet at the time. If you don't have 4.000 or later, you can download that here.