They're easily visible in the PTS but they are also beside the three royal crest mounts, so just to make them stand out a bit, these are the three that it appears you can get with the Personality pack. The orange looks confirmed at least due to it showing in the teeny pic of a Black Orc on the site.
I'm more likely to go with the Black/Red mount to replace my Manticore but I am really tempted with the Black/Green as well, just looks very warpstone themed. But no rush yet to decide. I'm just glad that I get my mount Pork back (he's named after the Orcish god of boars).