They'll recycle existing models with the bare minimum of changes (if any, see the season 3 preview showing the Burn) to represent future ships. Does that count?
After watching the trailer for the millionth time, i dont think that scene is depicting the burn. The Hiawatha type looks like it's crashing into the same facility that book is rescuing people from. The ships look pretty decrepit so maybe its some type of ancient starfleet musuem or junkyard.
The starfleet wreckage we see at the start of 'that hope is you' is of a brand new design. Also there's the scene were discovery has a small vessel in a tractor beam which might be a 32nd century starfleet shuttle. So i think we're definitely going to get some new and unique designs.