Double XP for the weekend starting at midnight tonight. I'm already eagled up so it's not going to help me but I'm sure I'll still be playing most likely. I just wish they would unlock the expansion weapons for me I haven't been able to get the shotgun or the second engineer gun yet.
I just went 47 and 10 on metro with over 12,000 points plus three medals. I'm warmed up for the weekend I think.
Edit it starts at midnight on Pacific time.