I think you're all missing the "which is set to bring back more nostalgic features" part of the statement. So I'm going with a retractable aerial, a resistive touchscreen with stylus and storage expansion via compact flash card.
I also own a Priv but have been crying out for a landscape keyboard since the days of the Motorola Droid 4 or even better the HTC Windows Phone 7 (with arguably the best OS for productivity). This is the perfect phone format IMO. I am elated that someone is finally producing a phone with a decent sized screen for media consumption with a good sized keyboard for productivity.
A leather slip-in sleeve is the perfect type of case for a slider keyboard phone. Leather just gets better with age and wear, and my Blackberry Priv still looks brand new.