Last night on PTR a couple bosses besides Iron Council were accidentally activated for a period of time. Kologarn, the boss on The Shattered Walkway, was up for a brief moment, although he would despawn shortly after being engaged. Likewise for Razorscale, a boss in the exterior portion of Ulduar. A funny moment occurred when Daelo announced in general chat "Razorscale is not up." Shortly thereafter, when it became clear that the boss was, in fact, up, the "SERVER SHUTDOWN" message was broadcasted to all players. Oops!
But the most interesting thing about this fillip is that Migol of the guild <Artifice> on the Shadowsong server and his raid managed to actually start the Razorscale boss event and see some of the mechanics involved in it. He posted his experiences on the WoW PTR forum, but as they may be construed as "spoilers" (Razorscale isn't due to be tested until March 9 when the encounter appears on the EU PTR) I've decided to reprint them here for safety, after the cut.
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StratFu
Razorscale should drop a mount of himself -- I need more dragon mounts, darn it.