http://xbox360.ign.com/articles/108/1082381p1.html
IGN: With the inclusion of things like jetpacks and sprint armor abilities, it seems like you would have to take a whole new approach to level design. How did you begin the process and how did you ensure that you were constantly thinking about how to incorporate the new gameplay elements properly?
Chris Carney: Jetpacks and Sprint definitely change the way players move through the environment. We started much of the level design before these elements really came into their own, so they did not initially impact the design of the levels. However, as we have expanded the capabilities of all of the armor abilities, we have had to react somewhat. That one jump that used to be "challenging" is now "forgotten" with Sprint. But we have also tried to balance each armor ability appropriately so their simple use does not dominate the environment. This has required extensive testing and iteration and hey, everyone will be continuing to assist us in this process by playing in the Beta!