Priyam
Taking your iDevice to max
No , they changed it for all new partners
support.google.com/youtube/bin/answer.py?hl=en&answer=138008
Also few weeks back I had made a new account for a new game, I had enabled everything and verified my account but I DIDN'T get it immediately. I didn't exactly count the no of days but i can guarantee it was longer than 20+ days before I got the custom thumbnails.