Servers will be coming down tomorrow morning (12/23) at 3am for approximately 2 hours to address the following changes:

• BattlEye had a few non-gameplay related issues which we want to address. We’re going to offline it to work those out and examine a lot of good data; it will be back soon.
• Mittani helmets corrected
• Tintable hoodies are again tintable
• Hoodies now correctly hide hair
• Some missing assets corrected

Source: Reddit r/H1Z1