On an iPhone 6, I'm still seeing the issue of scrolling inertia not being equal from left to right, in the app switcher. I'll have to post a video on this, as I've only seen one other person mention it. I've noticed a lot with 9.2b1 and now b2 on an iP6 that scrolling left in the app switcher (towards the home screen) is generally much faster than scrolling right (away from the home screen). Generally wouldn't complain or even mention a feature being faster, but in real world use, after double clicking to enter the app switcher, and then scrolling around for an app - the behavior often while scrolling towards the home screen seems to jump several, if not all of the open apps...bringing you directly to the home screen. I don't hammer on my phone, but I've noticed that regardless of the amount of force being used (slow swipes, fast etc) it's almost always twice as fast while swiping towards the home screen, and almost always skipping and stuttering over an app or two - sometimes skipping all of them. I'll try to grab a video, like I said I only noticed one other person mention this specific issue at least in this thread.
Side note: I have noticed at times that scrolling is not only smoother, but also much more reliable if you slide across the grey area underneath the apps - rather than swiping across the apps.
Aside from my issue with this, everything else so far remains identical to b1. It's looking good!
Edit: I noticed a lot of people mentioning the blur when tapping the far left icon in the app switcher. On b1 it just blurred and then refreshed the app, on b2 it is now cutting the app in 1/3, showing some of the background, before stretching out, blurring and then refreshing the app. Reported.
Edit 2: home screen going all the way to the end of the carousel (and beyond if you try) is still a thing. Also reported.