Please make it clear on your question that this is about the iPad.
On the iPhone it still shows a deck of apps, and we still swipe up to "kill" the app. The only significant difference is that there's no more the "home" card, so clicking outside the cards will go back to the home screen (or previous app). There's still plenty of bugs there (like an app is shown and before we swipe up, the animation was still ongoing and a different app is killed, but hey it's the first beta).
Now on the iPad, the first time I saw the apps side by side, with no swipes anywhere, I got confused. Then I was able to touch "the right way" to make the apps show the tiny tiny "(X)". I'm sure I only found that out because I have a 6S and am already trained on the difference between a "light and long press - to manage the apps" vs. "a slightly more presure and whatever press. - that will enable the force press on the app", making it next to impossible to delete and rearrange apps on the 6S.
BUT. Even if I press the ✖ on the apps, they are still visible on the dock, on the right side of the divider.
So officially Apple broke everything, as a person without "reading the manual", can no longer kill apps. I do mind seeing the apps on the spread out card deck (I do need to kill apps, but that's me). What I do really really mind is seeing the app icon on the new dock, and not know how to take it away from there.
Moving it away from the dock into the middle of the screen will keep it on the dock, and rearrange the app to move to whatever it is dropped (so, in practice, it will screw up the arrangement of the apps).
Well, again, beta1, I'm sure they're just toying around and they'll fix it.