I'm looking forward to it and will definitely buy it.
As a TTS user and audiobook listener, this model is ideal for me.
As far as support is concerned, I have only seen the update coming out for 2 years, which is not entirely true. My Inkpad 3 delivery updates constantly.
The ergonomics look interesting, compared to Inkpad 3 it is not that long. The ERA could be a little lighter on the ligament, but the built-in speaker has its price.
As for the software, after the last update you can see improvements, but still the most readable I use Koreader, which works quite quickly on Inkpad.
The price is also acceptable, for me it is an interesting device that offers a lot, I will definitely buy.