No, I didn’t apply. But my memory of reading posts when they started the trial is that it was more of a black box than the Mondo beta waiting list. I think they added some number of people who applied (~100) and then stopped, so they could refine the offering based on the experience of those who got accounts.
I get the impression that there won’t be any more business accounts opened until the next stage of launch (whether that’s a larger beta or the proper launch, I don’t know). But I’m also under the impression that this will be very soon, so hopefully you won’t have to wait much longer. And you’ll benefit from the improvements made from the initial testers. 
Edit:
Just had a quick look at this thread, and it looks like if you message support, they might bump you up the list. As @gmclean says, they seem to be rolling the accounts out more widely now: