Purely an educated guess, I would suggest that they won't be releasing improved versions of this watch. I think the market for the Bentley is relatively small when compared to other watches that they could be working on. I think they may have made these watches from pictures, rather than from the real article. Seeing though the current Bentleys are almost spot on, I think they will invest their time and money on other watches. That's my feelings on the matter.
The current Bentley's are very good. With a double AR coating, you will have a very accurate replica, of a very nice watch.