the next world is announced whenever Inno decides to. An educated guess would be pretty soon. Either just before Christmas pecetime (to start in between peacetimes) or in between peacetimes to start over new year.
I dunno about pre-mades though. It will probably depend on the speed (please no 1, 1).
While voting for settings is something I know our community likes I also know players get upset when the voting options are limited. Sometimes there are settings I know I can't get for a world or settings a world has to have which limits what options I could put in the voting. This results in polls where I might only be able to have a vote for 3 different settings because the world needs to be fast or be conquest or morale has to be active. So I can't offer choices on those settings for that particular poll. If players are fine with selecting from among even limited options then I will certainly try to do more polls going forward but it won't be for this next world unfortunately.