Around this time iOS should really be getting beat into shape. I think there will be 2 betas in August. If not the upcoming beta, the one after should be really, really polished and indicative of how well the final version will be.
Let's hope. Apple has been really disappointing with the polish. iOS 8 never really got "beat into shape." People were saying how 8.2 made a world's difference, and then it was 8.3, some even said 8.4 improved things a bit. But I barely noticed anything at all between any of those, except for minor things being fixed, like the annoying banner issues, pinch to close not working right at all on iPad, and the dreaded copy and paste issues. I don't understand how Apple spends months working on a new update (or in this case 2-3 weeks), releases a 300MB+ update, and nothing is different at all. 8.2 and 8.3 even INTRODUCED plenty of issues, the status bar twitching when unlocking the phone with 8.2 and constant "CoreTime" logs, and with 8.3 I noticed that while bringing down the Notification Center while unlocking the device or opening an app (landscape on iPad) it would come down in portrait until the animation finished. All the way through iOS 8, dozens of battery percentage values would simply skip, and UI lag was all over the place, mostly stuff carried all the way through iOS 7, never fixed!
I know I can't say much given that I have only used Public Beta 1 and 2, but iOS 9 betas seem similar so far. Hopefully things really get beat into shape for the 5th, and hopefully 6th betas. There's nothing else they can do at this point but fix bugs and hopefully performance at this point. Performance luckily is close to on par with iOS 8 as I left it, it's just the App Switcher that is horrible.
I don't want it to be "close" to iOS 8, I want it to be *better* than iOS 8, just like how they claimed. I could never tell that Metal is being used for the animations at this point. I know, it's a "beta," but just look at El Capitan. So far, UI performance beats Yosemite which is awesome. That's what I want for iOS.
Anyway, onto the actual topic. I'm thinking next week for Beta 5 (PB 3). It could come this week but I'm not getting my hopes up. As long as things really smooth out before public release, I'm happy, doesn't matter to me whether there's only 1 beta left or 2.
I know is is really jumping the gun here, but I really am excited to see iOS 9 in it's final forms. I hope we get one MAJOR 9.x performance/UI revisions update, not a ton of pointless ones like with iOS 8. I quite enjoyed the 7.1 update.