Well I've just got myself copied over to the PTS and as I know a few folks have been asking about mounts, here's screenshots of the new Chaos standard ones. They're 15g from the usual mount vendor.
First off for comparison purposes, the current mount. This new one is called the Maroon Marked Steed
And this is the one I'll be getting, the Decayed Flesh Marked Steed.
Unfortunately it's not copied over my guild, so can't get the guild rank 25 ones to show you. Also it appears the mail isnt working on the PTS, so I also can't send enough gold to my alts to get shots of other races mounts.. doh. But still these are quite cool.