Perkel
Arcane
- Joined
- Mar 28, 2014
- Messages
- 16,266
The trailer wasn't a teaser, it was quite detailed in terms of mood, assets, characters, even story. They must've had SOME preproduction done at the time of the announcement, it's not like Iwinski got the idea on 30th May and announced the game on 31th.
That was entirely made by Platine Image not CDP.
What you said is true there was some planning behind it but we are talking here about production not some nebulous planning. Many games ideas and early work are like 10 years or more before game is released.