11 teams at all. (not all of them are fully ready)
As far as i know4 teams from RU (who will be play 100%) and 2 teams from EU, other have just submited their applications.
Tournament administration checks each player individually.
No.
If you are want to join as free-agent, you will need to communicate with your teammates.
You don't need to speak, but hear your teammates is extremely important.
This tournament will take 2-3 hours in a week, just to play 5-6 matches.
You can register as free-agent, so there is no problem at all, you don't need a premade or team to participate.