Ian's is the only profile I've seen this issue with. He's giving two talks:
How 5 People with 4 Day Jobs in 3 Time Zones Enjoyed 2 Years Writing 1 Book
Give a Great Tech Talk
His profile doesn't show up when you click the "person" icon on either. It caught my eye on the first talk because he's the only presenter, so it looked broken. On the other, Josh Berkus is co-presenter, and his profile appears.
(Other talks with two presenters do display both, for example "How to Ask for Money.")
This is just a "would be nice," but it's the only thing that occurs to me that I'd add feature-wise. Currently, to go from one day to the next, I have to go to the menu and navigate. Adding the navigation to the header would make it much smoother and is probably (?) easy.
Other navigation memes I tried and that people might want are simply scrolling past one day to the next, or swiping sideways to go forward and back.
Currently the loading screen is only displayed for a brief period, and then the screen goes black while the app actually loads data from the Internet, which looks wrong.