1- Has there been any word about this being directx 9 or directx 11?

2- Is it going to have 64 client?

3-Is it going to utilize more than 2 cores?

All of these questions are based off launch release.

If these have been answered by devs already. Please link the source.

As far as I'm aware none of these questions have been formally addressed, I guess you'd have to wait for the beta maybe.
Sorry pal.

No actual information, but we know they are aiming for older systems, though I can't imagine they would make it without support for the more recent tech.