So my first impression review:
Man this is one well thought out and beautiful app! I cannot believe the care that has gone into its design. Definitely a prime example of good Halo. I only have a few minor gripes with the app as of right now. I will add any bugs I find as I come across them:
-the fade effect transition between pages is really distracting, jarring, and unnecessary. I would like to see it go away.
-as another user stated, it would be really nice to have youtube videos playable from within the app itself, a la Google Currents
-A feature I would really really like to see implemented is the ability to swipe from one story to another without having to stretch my thumb all the way to the top left hand corner of the screen to go back to the list view when you first open the app. A left and right swipe to go to the next / previous story (like in Pulse) would be nice, or maybe even just tiny grey arrows one you get to the bottom of the page. Did I mention that I would really like to see this feature?
Thanks for making such a great app! Your developer deserves a lot of credit, as I'm sure this app is only going to get better with time.