I can tell you why we like the term open beta, and why we've been sticking with it. We really want to emphasize this idea of an evolving platform. What you see now is very different from what you'll see in a few months, and that's very different from what you'll see after that.

[...] For us it's really, really important to drive that message home, even in the name of the product: Home, Open Beta. Come in, check it out, check out what we're offering, but come back! It will be different when you come back.

Other products are changing like this, but it's very very unusual... we've really embraced those words—Open Beta—we're really comfortable with them. We haven't made any announcements about when we'll be moving past them or if we hit a major milestone or anything like that.

[...] It's changing so fast at the moment, so when would something significant happen that would shadow all the other changes, and make it significantly above that to justify making a big fanfare about it coming out, it would be... To be honest, we don't think about it, internally. We have our short-term plans, our updates, we're more focused on getting as much out there as possible.

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Via Ars Technica