I think focusing too much concern on a single sentence is a poor choice. We have also had indications from Mearls that the products produced after Essentials are being designed based on elements from the PHB, not the Essentials books.
I think we'll see some of the Essentials elements remain around in design, likely the format for classes and other advents in presentation. I think we'll see more willingness to experiment - a trend that started with PHB2, grew with PHB3, and is simply continuing onwards in a logical fashion.
I don't think we'll see all simplified classes with rigid builds. Those are part of Essentials to make it easier for new players. I don't think they are a goal of 4E from here on out. I just don't think there is any reason to proclaim "4E as we know it is changed forever!" based on a single line, from a single designer, that could have multiple meanings or interpretations.
I think we'll see some of the Essentials elements remain around in design, likely the format for classes and other advents in presentation. I think we'll see more willingness to experiment - a trend that started with PHB2, grew with PHB3, and is simply continuing onwards in a logical fashion.
I don't think we'll see all simplified classes with rigid builds. Those are part of Essentials to make it easier for new players. I don't think they are a goal of 4E from here on out. I just don't think there is any reason to proclaim "4E as we know it is changed forever!" based on a single line, from a single designer, that could have multiple meanings or interpretations.