Will I be able to reserve my Guild Wars guild's name?
We don't know.
Will my account be able to join multiple guilds? Yes. Each character will optionally be able to join a different guild.
All characters from the same account in a guild will show as a single member. If one character belongs to a guild no further invitations are required to add more characters to the guild.
Are any features being added to support guild-based activities in-game? There will be guild achievements added and guilds may hold keeps in World versus World. There will be a guild calendar and you can participate in guild chat from a web browser.
Will guilds be segregated by character race? No. Guilds will be restricted by race only if the leadership chooses to restrict it.
Will we be able to create an alliance with our guild? We don't know.
How many members can join a guild? Higher limit than in the previous Guild Wars, up to no limit.
Will guilds have a Leader, Officer, Member ranking that limits their guild-management options? We don't know yet.
Will guilds have a way to recruit without using chat channels? We don't know.
Will there be guild halls?