Warframe Update 19: The War Within    Open Letter from the Digital Extremes team:  'Finally it's here' the developers and players said in unison with tears (of joy?) in their eyes! When traditional developers pen their open letters at launch, it's often the last step after months or years of development. It's often a sign-off to address the people who are about to dive into the finished work of a collective group. But Warframe is far from traditional and our work is never done.  T