Fonts can definitely be added via a FW update. I doubt Amazon will ever do that, but they should. They should also add way more options for font size, margin size, line height, etc. But they probably won't.

And yes I think most of the sharper text rendering is due to the new eInk screen and the redesigned light layer that degraded text on the PW1 and PW2. But they still need to add the ability to darken (make thicker) a font. The text is okay, but I wish it was thicker since the lighting is still wonky and uneven.