If S&W says they are making it again in 9MM and shoots 10 rounds, why don't they just call it a Model 39? That's what a 39 is in the first place. And that's the basic pistol S&W used to build the Model 52.
Model 52's were hand-built. Also called the .38 Master, parts from M39's usually won't work without hand-fitting. H@ll, parts from one 52 many times won't fit another 52.
Model 52's weren't built to handle 9MM loads. They load and shoot .38 mid-range wadcutter only. They are strictly a bullseye target pistol. The magazine only holds 5 rounds as called for in competition. And there are a few mechanical differences that make a true Model 52 unique.
That being said the actions are incredibly smooth and well built. Feels like you're sliding velvet together.
I can't envision S&W building a real 52 again. Hand work costs too much these days. Sounds like S&W is building the old Model 39 again.
I've got a Model 52-2 complete with barrel weights, barrel wrench, box and all the goodies. It's one of my keepers along with a cherry early Model 41 that's been Clark converted.