Official changelog is here: http://www.iupdateos.com/top-stories/ios-8-released-heres-the-full-changelog
Keep in mind that is my opinion. I own an iPad 2. I've only scratched the tip of the iceberg.
Safari:
*The top bar shrinks when the page is scrolled down, and only the domain name of the website is shown (e.g. "smashboards.com"). It was already on the iPhone, but the iPad's screen is pretty big, so what's the point? You can tap it again, sure, but scrolling again just makes it shrink again. You cannot disable this.
*The tab bar only appears when you have multiple tabs open (if the top bar is in its normal form). I don't see the point of this either. The only effect of this is to hide the page name, and I don't like that at all. You cannot disable this.
*The contrast between open tabs and unopened tabs has been reduced. It's really annoying, as it's harder to tell where the boundaries are. I haven't tested to see whether or not the increase contrast option will help with this.
*There's a new tab view if you zoom out when the page is completely zoomed out. There's also a new button for the new tab view.
*The address bar has slightly changed shape, and is more rounded. The progress bar is at the bottom of it, and has rounded sides that match up with the address bar.
*In private browsing, you must log in to the same website in each different tab. I use private browsing so it doesn't spam the address bar with suggestions from my history, so this is annoying for me.
*If you switch to another app and back, you must tap the text entry box to type again. It's minor, but somewhat annoying.
*You are no longer asked whether or not you would like to keep or close your tabs when swapping to private browsing. You now only keep your tabs, and must close them all manually if you wanted to close them all at the start of your session.
Photos:
*iPhoto no longer exists. All of your iPhoto images now appear in your normal camera roll.
*The camera roll has been renamed to "Recently Added".
*By default, when opening Photos, you are greeted with two folders, one for videos and one for "recently added" things. You cannot just have it in the camera roll by default anymore.
Other:
*The Emoji keyboard is automatically installed after you update. The globe icon is a smiley face. You can delete it.
*Autosuggestions from some smartphones have been added. This can be disabled.
*There is a new preinstalled app known as tips. This can be useful for new iOS users, I guess. It cannot be deleted.
*Podcasts is now preinstalled. You cannot delete it.
*You can edit some of the notification center settings right from the notification center.
*Locking no longer fades to black before the display shuts off, and instead the display is turned off immediately, like in iOS 6 and below.
Keep in mind that is my opinion. I own an iPad 2. I've only scratched the tip of the iceberg.
Safari:
*The top bar shrinks when the page is scrolled down, and only the domain name of the website is shown (e.g. "smashboards.com"). It was already on the iPhone, but the iPad's screen is pretty big, so what's the point? You can tap it again, sure, but scrolling again just makes it shrink again. You cannot disable this.
*The tab bar only appears when you have multiple tabs open (if the top bar is in its normal form). I don't see the point of this either. The only effect of this is to hide the page name, and I don't like that at all. You cannot disable this.
*The contrast between open tabs and unopened tabs has been reduced. It's really annoying, as it's harder to tell where the boundaries are. I haven't tested to see whether or not the increase contrast option will help with this.
*There's a new tab view if you zoom out when the page is completely zoomed out. There's also a new button for the new tab view.
*The address bar has slightly changed shape, and is more rounded. The progress bar is at the bottom of it, and has rounded sides that match up with the address bar.
*In private browsing, you must log in to the same website in each different tab. I use private browsing so it doesn't spam the address bar with suggestions from my history, so this is annoying for me.
*If you switch to another app and back, you must tap the text entry box to type again. It's minor, but somewhat annoying.
*You are no longer asked whether or not you would like to keep or close your tabs when swapping to private browsing. You now only keep your tabs, and must close them all manually if you wanted to close them all at the start of your session.
Photos:
*iPhoto no longer exists. All of your iPhoto images now appear in your normal camera roll.
*The camera roll has been renamed to "Recently Added".
*By default, when opening Photos, you are greeted with two folders, one for videos and one for "recently added" things. You cannot just have it in the camera roll by default anymore.
Other:
*The Emoji keyboard is automatically installed after you update. The globe icon is a smiley face. You can delete it.
*Autosuggestions from some smartphones have been added. This can be disabled.
*There is a new preinstalled app known as tips. This can be useful for new iOS users, I guess. It cannot be deleted.
*Podcasts is now preinstalled. You cannot delete it.
*You can edit some of the notification center settings right from the notification center.
*Locking no longer fades to black before the display shuts off, and instead the display is turned off immediately, like in iOS 6 and below.
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