The Space Marine codex has leaked, at least quite a bit of it. There is a lot in these leaks, and I have just now started to get through them.
original source this leak is here
https://ttgamingdiary.wordpress.com/2017/07/21/review-codex-space-marines-datacards/
All the pictures are on this link (all from the original source above)
You can also see it here from our friends over on La Voz De Horus
https://www.lavozdehorus.com/filtracion-imagenes-del-codex-marines-espaciales/
Here are a few of the leaked images. There is much more beyond the links above.