Maybe I'm alone in this, but I really preferred the username info panel off to the left instead of on top of each post. Just tried the new beta on a PC, an iPad, and my phone. Most of my Beyond'ing happens on my phone or iPad, depending on if I'm taking a shit or not.
With the old layout, I can double tap, and read the thread, and if I need to see who posted something, simply scroll left. This new layout seems a little too "busy" Maybe.