Nameless Acolyte's message from Discord's news section of FKG:

Hello everyone, The Popularity Contest has now received a different purpose as, due to certain issues, we can no longer introduce the initially announced re-skinned versions. The 3 winning Flower Knights will be instead included in a Special Gacha Machine that will release shortly after the event. All users will be compensated according to their level of participation in the Voting Poll. We sincerely apologize for the inconvenience, The Flower Knight Girl Team

And blobz from unofficial status updates:

About compensation for the voting event, gacha at the end of event should not be considered as one; there will be compensation given at the end of event: there will be 3 tiers of rewards based on level of participation in voting.
Everyone who voted (even once) will receive compensation.
Content of tiers are not (yet) known (to be edited when/if that changes).

It seems they'll give us something at least... I hope it won't be crap but...

EDIT

New info and discussion on compensation in this thread: CLICK