Actually, I think it's pretty exciting. We already have plenty of weapons, and the hidden ones are bound to be especially good. I prefer this to more Grakatas or Ankyrosses.
It sucks a bit that all the cool stuff will be a huge grindfest to get, though...did you see the screenshots of the dojo building primer? Tens of thousands of resources for a simple t-shaped corridor? OLOLOLOL. And of course, Forma, another thing that can only be gotten through platinum or alert rewards...as if we needed more of those.
I am even a bit surprised by the sheer amount of stuff they included in this update. 2 tilesets, a warframe (2 if you count frost prime), 20 weapons, a sentinel, 9 mods, dojo building + dueling in dojo, polarize system...