Gorilla Glass (GG) is one of the most recognizable brands of toughened glasses today, thanks to their marketing and widespread usage in various gadgets and automobile industry.
According to Wikipedia, it's basically an ion exchange ($\ce{Na+ <-> K+}$) within the glass (boro-/alumosilicate?) matrix which gives this material resistivity against scratches and various mechanical impacts:
Still, there is a new generation of GG released every few years, showing better properties with thinner samples, making me think it's all not just about ion exchange.
Are there other ways of "chemical strengthening" besides cationic exchange that can be utilized to strengthen the glass, keeping it flexible and less fragile at the same time?