Pure speculation on my part but...the 450S is a fairly recent addition with blacked out window surrounds and the the galley
layout has been switched around all updating the look of the boat
-you would not think Lagoon
would release a new variation of the 450 if a new model was imminent .
Our local lagoon broker suggests 2020? Over 500 sold still with a 6 month wait list.
What he did say was the replacement would be good if it was a 47 footer to fill the gap between the L42 and L52 although the L 450 at 45 foot 10 is 2 inches short of 46 feet anyway .