Adventurers of Telara, you've kind of got a good news/bad news situation taking place here. The bad news is that RIFT is getting invaded, which was already the case. The worse news is that it's now being invaded by the Hellbugs from Defiance, which usually require a great deal of automatic weapons fire to be put down. The good news is that if you can somehow manage to overcome the distinct lack of any firearms and put down the invasion, you can keep a Hellbug around to ride! Wait, that might still be bad news.
Yes, Trion Worlds is kicking off a cross-promotional event with new fire rifts that give players a chance at Defiance-related rewards, most notably the chance to pick up a Hellbug mount. The event is open to all players, even if you're just trying out the game's Lite version. No word on how long the event will last, but it's probably best to assume that it won't be forever -- which is also sort of a good news/bad news situation, unless you wanted to see the game overrun by Hellbugs.