Apparently there is a good chance that guesting is not going to be available at launch, but instead free transfers will be offered. However, due to Crystal Desert maybe becoming full there can be an issue were the guild fragments into multiple realms.
It has already been stated by ArenaNet that when someone is on a different realm not only they cannot WvWvW with others, but guild influence is separated from them entirely. Which mean perks, bonuses and guild bank are not shared between realms.
It seems that people are unaware of the issue, because in this topic people are wanting to have no backup server
If think we really need to establish one soon, officially... stated by the officers. Because if not, there's a very good chance that the guild will branch out in multiple servers... being very fragmented.
Free transfers in beta had a cooldown, so say if someone wanted to help someone in the guild they would have to use a free transfer and then discover they cannot come back to crystal desert for 3 days. If the guild is really fragmented, that 3 day cooldown essentially means you can only play with one person every 3 days.
While there is no confirmation about transfers being on a cooldown, I still think we should plan for the worst. Even if there is no cooldown, anyone who transfers cannot go back to Crystal Desert due to it being full.
So it's just better overall to declare a backup server and have 2 communities in case, that way no one has to worry about transfering to help others.
So please, officially set one up to be visible by everyone so that way we don't have guild members who can't play with us and end up leaving :(