Since world 30 filled up so fast, the Tribal Wars official team announced that world 31 was opened on December 26th.
The official press release is as below:
Since world 30 filled up so fast, we're opening a new world.
World 31 opens on December 26th between 19:48 and 21:36 Server Time.
If you are playing world 29 or 30 you can not play world 31.
I realize that many players are looking for a faster world, with packets and no archers, please be patient, when 5.0 is done on worlds 1 to 28 and we get around to 32 and 33 we will in fact make sure that we have a faster world with packets, no archers, etc. These are pre-set settings that all language versions are using so we can make sure everything is working right.
I do not have an exact date for 32 or 33, but the current trend is opening a new world every 4-6 weeks, so watch for more announcements then.