You're all wrong. If anyone would bother to check their files, you'd see that the game currently takes up about 20.3GB of space on PC, so they are, in fact, adding something in this update. I'm not sure if it's actually 10GB worth of content, or just 'reserving' the extra space for future updates, but it is, in fact, space that the game was not previously using.

It's funny how angry and insulting people will get over something that takes literally twenty seconds to fact-check...