User blog comment:Haloking7410/The legendaries so far we know are gonna be in the presequel/@comment-5686539-20140729230115/@comment-5686539-20140731103913

It's in IGN's video about Wilhelm for sure. Link is on the mainpage to the hub on GBX. Direct YouTube link is on the Mauler class mod page, Zim weapon page and Celestial Enforcer page.