I'm logged into Beta Zone right now. I held down my BB button and it shows I also have App World open, I didn't open it. When I click on the App World icon it goes to the Beta Zone page I'm on. I hope this means that they are going to have Beta Zone downloads accessible right in App World.
Edit: it may be a glitch. I didn't open up App World and am assuming it was opened when I logged into Beta Zone. But on further investigation clicking App World after holding the BB button it will open the last thing I was in.
Edit 2: Tried to make it do it again and i couldn't, I guess it was a fluke.