I believe it's the same day as when all away game tickets go on sale, which I think is a Saturday but I don't know when. Tickets are $55 each ($50 for ticket, $5 City of Arlington fee). Yes you will need sports passes. I believe you only need IDs if you're the one buying tickets.
I went last year and it was a madhouse. Only the first half of ticket windows were open and there was no line distinction really. Then halfway through they opened up the other ticket windows and a lot of people ran toward them. So it was a bit nuts.
[This message has been edited by blumby (edited 8/26/2010 11:06a).]