The 70, 65 and 59 models have been offered by Hatteras for a few years, now, I think. I believe these boats have been in the model lineup for a while. I glimpsed a boat with outboards, but I can't recall where I saw it- I don't think it was on Gulf Coast's site, but I could be wrong. I emailed Hatteras asking about new boat designs, but I have not heard back yet.
The production convertible market belongs to Viking, who went to a lot of trouble to capture it while Hatteras was wandering around in the dark with their eyes shut. 'Sad' doesn't describe it; Hatteras Yachts invented these boats, basically, and dominated the market for ages. It reminds me of watching the English motorcycle industry dry up and vanish while Honda, Yamaha, and Suzuki took it over. (and Kawasaki, who were I think a bit late to the party but made up for it)
I hope Hatteras can win back enough market share to stay alive and maintain the name and the quality. For this I am praying and crossing my fingers, both.