Just looked again and found it a few minutes ago! Beta is installing.

Along with Xcode 7, which you would think would be on the Apple Beta Software Program page, but isn't.

Xcode betas are now made publicly available. I don't think you even need an Apple ID anymore.

Yeah, I found that too. I was just thinking "now that I stopped being a dumbass and found that the iOS beta right there, I bet the Xcode betas are in the same place." Nope!