I took the plunge and installed the new firmware. Obviously, I have only used it for a few minutes now, so I can't really say much about it.
However, I can report that I successfully installed it. Also, once it was installed I had no problem returning to the book I was currently reading -- at the correct place in that book.
It's hard to see what is different. The menu's and layout look the same, but I guess I could be overlooking something.
I have seen one positive feature. If you hold down the next page button, it will continue to 'turn' pages. This certainly makes it faster when you need to move forward a couple of pages. It turns fast enough that you really can't skim the pages as it turns. So it works if you know you need to move ahead by a specific number of pages, but its not quite perfect if you aren't sure how many pages you need to turn.