This takes my vote for best bug of the patch, if not best bug ever. And not just because it's taking place on my home realm. Apparently as of yesterday's patch, each and every gnome rogue on Shadow Council (US) was endowed with the ability to speak and understand the Draconic language. Newly created gnome rogues don't have it, though, so please don't go flooding my realm with new characters. Get off my lawn!
There is one theory as to how this came to pass. The Scepter of the Shifting Sands quest chain, which was how the gates of Ahn'Qiraj were opened back in the day, has as one of its parts a quest to reassemble "Draconic for Dummies.". Apparently at some point in the Wrath beta, players who completed that quest were awarded the ability to speak Draconian. Also apparently, one gnome rogue on Shadow Council by the name of Mag had just recently finished that quest before the patch hit.
So what if Blizz attempted to patch in learning Draconian as a reward for that quest, but accidentally gave it to all characters of the same race and class as the player who completed the quest? It sounds unlikely, but other servers don't seem to be affected by this bug; I'm having trouble thinking of an alternate explanation. If everyone who's completed the Draconian for Dummies quest could check their languages, that would be helpful. Also helpful would be reports if there are any other characters that seem to have the language.