You can lead a horse to water but you can't make him suck your... Any "interesting" surprises will not be to everyone's liking, don't add or remove content because of a few posts, just make the game you want in the way you want. Tell any complainers to simply look at any of 10 billion other games until they find content they like instead of asking a developer to make changes to a game in development. That being said planning content that adds a new tag should be revealed as "planned content" so that players/supporters get upset they backed you when you didn't share planned content.