Logic Pro X does not have a downloadable demo from the store or Apple’s site. It costs $200. The previous version that was available the day before Logic Pro X also cost $200. Apple balanced its price at a perceived value for both new and existing customers and, to my knowledge, none of its apps have ever gone on sale.
That’s it, there’s your answer. Apple didn’t need a blog post or an interview or a leaked memo, it spoke through action.