Hi Victor,
If you look at the second page that was posted from "Focke Wulf Fw187" by Dietmar Hermann and Peter Petrick -Aviatik Verlag 2001, you can clearly see that an official Fw document is dated 6/8/42, backing up Skybolt's comment above. However if you look at the Stuka variant that is dated 28/9/40.
Here's an almost direct link to the 1942 document in full, which features a DB 605 engined version as well as a BMW 801D engined version:
Click to close any splashscreen that might appear, then click on "Digitalisat anzeigen", which will load the document.
Interestingly, this document doesn't seem to be a numbered "Baubeschreibung" ('construction description') ... the one for the Fw 187V-4 was Baubeschreibung Nr. 181, the "Stuka" drawing is annotated "Bauschreibung Nr. 235", but the 1942 document not only lacks a number but also doesn't state "Baubeschreibung".
Maybe that is an indication it's only a preliminary project or something, but I don't really know ... that would possibly imply that the 1940 Stuka project was a bit more serious, which I'd find surprising. I've frequently been suprised before, though!
Regards,
Henning (HoHun)