The official website
makes no exact statement of when we can expect Dawn of War 3
to hit the shelves.
All they mention is that the new Dawn of War will be released in 2017. No month, no quarter, only the year.
In October of 2016 however Sega's website mentioned that the next Dawn of War will be released on April 30:
If we check their webpage
now however, it is set to "TBC" (to be confirmed). This means it most likely was a placeholder date. But who knows? The release of Dawn of War 3 might be sooner then we think!