I'm in the process of opening 100 salvage crates of each type and listing the results. Will probably post it on the actual salvage crate item page. tl;dr from what i can tell though - mounts are not rare from these salvage crates :)
I sure hope they have something in place for those characters that didn't get the cloak during mists of pandaria... i got it on one character but not all of them.
I'll take 175 dabloon boxes over 2-3K targeted mounts.
So far I can only find the base appearance for the legendary cloak in the dressing room... When will the other appearances be added?