According to this article.
EDIT: Sorry, I'm still a newbie when it comes to posting news.
Are you excited for La Tale? Can't wait until September 18th to play it? Well, here's your chance to get a taste!
From August 21st through September 3rd, we will be holding a La Tale Open Beta.
While this is a test and the data will be cleaned up for the official launch, the Open Beta
will be full of mini events, power up bonuses, and more surprises! Plus, if you join the
Open Beta, you can try on Astro items and if you're lucky, you may win special prizes for the official release!
And, of course, it is open to all OGplanet members and completely free. So join us for the first open look at La Tale on August 21st!