What is going to happen to Order Guards and Chaos Guards?
They will actually become a new part of the guild system. You will be able to declare your guild as an Order guild or a Chaos guild. Order Guilds and Chaos Guilds will always be at war with each other, so no declaration needs to be made.

How does my guild become an Order or a Chaos guild?
I’m glad I asked that question. Under a new guildmaster option the guildmaster may declare his guild as an Order or Chaos guild provided:

What happens to all the members who do not meet the requirement that a guild master had to meet to change the guild into an Order or Chaos guild?
All of these members will no longer be a part of the guild.

Do I have to maintain these requirements?
Yes.

Will there be any changes to names?
Yes. All members of Order and Chaos guilds will be required to display their guild abbreviation. If your abbreviation was toggled off, it will be toggled on. At the end of the guild abbreviation, either (Order) or (Chaos) will be displayed.

How do I get an Order or Chaos shield?
When you become a member of an Order or Chaos guild, ask a respective guard by mentioning "order shield", or "chaos shield" to the appropriate guard.

Do I have to wear the shield?
No… but they are nice shields.

How will I be able to determine who is a fellow guild member or a rival guild member?
They and their name will be GREEN or ORANGE respectively when your mouse pointer is over them.