That's right. The only way I got in, was many months ago, Sony opened registration up for "Underground" members. I signed up immediately, and several months later, with no confirmation, I opened the Playstation Store and saw it sitting there. It was the very first item shown on the store list.

So, if and when you do get into Home Beta, it will always be listed as the first item on your Playstation store. That will save you the trouble of looking for it when you go there. It is still shown in my store, even after downloading it.