They have never given any indication that they intend to do so, over the years since the Sub was released. Given that they don’t ’pre-announce’ features in order to maximize marketing efforts, it’s hard to put a definitive answer, but I wouldn’t be holding my breath. 

Thanks for your response and insight Bruce, makes sense. 
 

Daniel. 

I wish it were different, mind you….but I don’t want to be leading down ‘the primrose path’, as it were. 

Although honestly, for my ears, and musical tastes, I find there is more than enough bass from the PLAY::5 gen 2s I’m currently listening to. But emphasis on ‘my’, as tastes vary from situation to situation ;)