It'd be nice if system updates on a console we paid money for weren't shrouded in secrecy. It isn't like if something is found out about ahead of time it's going to change sales positive or negative. It's for people who own the system to look forward to. It's just silly, in my opinion.
I think the betas are there for all the "normal" customers to get some information for what's coming. And big features would get a bigger tease, or even news I guess.