With the heroic versions of Trial of the Crusader going live yesterday, raiding guilds are already venturing into the more challenging versions of Tier 9. As of evening Tuesday EST, the European guild For the Horde has claimed a world-first A Tribute to Insanity-10 (a no-wipe full clear of the instance) on 10-man heroic Trial. Unfortunately, I don't speak German so I might be missing some of the finer points related on their website (anyone who can shed more light on this, please drop a comment!) but it looks like they weren't deliberately aiming for the achievement until they reached Anub'arak with all 50 attempts remaining, and then decided to go for it. Next in achievement progression? A Tribute to Dedicated Insanity -- repeating it without any gear from 25-man ToC, which is broadly equivalent to the Herald of the Titans achievement. Ouch.
Boubouille at MMO Champion has since confirmed that the Swift Horde Wolf and its Alliance counterpart the Swift Alliance Steed are drops from the tribute chest upon completion of the no-wipe clear, and it's quite possible that the mounts also drop from the 25-man version as well. However, I doubt we'll be seeing A Tribute to Insanity-25 this week, as none of the guilds doing the heroic-25 mode have reported a wipe-free experience thus far.
We'll keep an eye on guild progression for you, and congratulations to For the Horde!