Normally I'm very critical of modern UI's, but this time I like it!
What I do miss in this Beta is the game page's wallpaper in the background. I loved that, it not only shows which game page you're viewing, but also gets you in the mood, and adds a personal touch to the page. Now it's just generic shades of grey everywhere.
I think that's an important quality that should not be overlooked, and hope it will get picked up later down the line.