Are you sure of this? I thought the language used in the demo was Apple 'moved them from the notification panel to left of the main home screen and left of the lockscreen' implying they are no longer there. If they're still in the pull down panel, I'm a happy camper.
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I don't think so as how would you use the swipe to the right to navigate back. Everything I've seen so far implies they are only accessible left of the lock screen and first home screen.
So for example, I'm in an app that I need to sign into. Presently in iOS 9, I pull down, tap 1Password in the Launcher widget which takes me directly to the 1Password app, I copy my password and use the 'Back to xxxx app' link on the top left and immediately return to the app to paste my password. On iOS 10, if the widgets are no longer in the pull down panel, I have to hit home button, swipe left, tap the 1Password button in the Launcher widget, copy the password, then double tap the home button to open the recent apps, tap the original app, then paste the password--lots of extra actions there.