1. The game is multiplatform, not in collaboration with any of the big 3.
2. Does Koei Tecmo have an E3 showing?
3. E3 is not just the days the the big 3 give their presentation. Its the entire week. So they did announce it at E3.
That's the first time I hear/read/see something like that.
And after checking it, no.
Gameplay > Graphics
Substance > Style
Art Direction > Realism