Maybe release monday? Nintendo site says X/Y maintenance that day.
X/Y maintenance is every Monday.
6 hour maintenance is huge compared to the normal 2-3
Still I wouldn't get you're hopes up... Hasn't been 3000 years pun ect...
There have been 6 hour maintenances earlier this month, no pokebank. Still, if they were planning on releasing it next week, Monday would be a good time. By then most of Asia should have transferred their pokemon over in the last week/weekend and the traffic in the rest of the world shouldn't be high at the beginning of the work week.