Guild halls I believe currently have a capacity of 25. For the larger guilds, there are several times that amount of people online during the peak hours.

What happens when a guild hall for that guild is full?

1. Is a new instance of that guild's hall created?

2. Can the 26th person not access the guild hall? If so, this one needs to be fixed.

I presume (please confirm) that the mechanics of PL are similar.