how many guilds will be in an island :
If there are 40 guilds in diamond league, there would be 5 diamond islands with 8 guilds each.
if there are 39 guilds in the league, there would be 4 islands with 8 guilds and one with 7. The 7 guilds island will include the 7 guilds with the lowest LPS closer to 901.
if there are 41 guilds in the league, there will be 5 islands with 7 guilds and one with 6. the 6 guilds island will include the 6 guilds with the lowest LPS etc . .
On live servers, islands with guilds with 1000 LPS are based on the prestige of guilds and going down, in the beta there is something else dividing islands in the 1000 LPS guild . .still trying to find out what this is, if anyone knows, it will be helpful