Unless I am behind the times, I believe we know Ra-den's model now.
On this page: http://www.wowhead.com/news=210031/5-2- ... -new-items
If you scroll down to the icons, you will see this icon on the first row, about the middle:
![Image](http://wow.zamimg.com/images/wow/icons/large/achievement_boss_ra_den.jpg)
If you click, it says "achievement_boss_ra_den"
Which looks a lot like this model datamined a while back. If you go here: http://www.wowhead.com/news=209850/5-2- ... tal-cities#.
There is a section with models and if you hover over this guy, it says "captured titan." Ra-den may be a titan? The lore will all shake out when we get there, but I think this is pretty compelling evidence. When I first saw this "captured titan," I thought of Ra-den but now seeing the achievement icon as well...
![Image](http://img547.imageshack.us/img547/5893/fferwg34234yh.png)
And yes I have searched to see if this had been said buried in some thread I overlooked, I don't want to steal anyones thunder here.
Get it? Thunder? Raiden--- ehh nevermind.