the voting is based on which variation A.) looks the best to you and B.) want to play as
even after playing the game the vote is still a crapshoot if you want to get technical because it is a subjective vote. But it is still fun to see which variation is most anticipated.

I was thinking why vote on something we haven't played yet. Just curious on that but since you explained it a little more I sort of understand.

If you don't like it don't vote,

The person above stated that the vote is for your most anticipated variation to play as

Simple

Come on, mate. Click the picture in the poll. Connect the dots.

Human receives information. Human forms speculative opinion based on information and prior knowledge/experience. Human has a bit of fun picking which he thinks will be best. Some humans will respond to description, some humans will seek out more information (eg; gameplay demos), some humans will respond to design differences. It's all good.