It's not often that the Staff like to offer "spoilers" of when the next Preset Contest will be and what they'll choose as the theme, they love to keep it all a surprise. It's nice to see you've taken such an interest in it though, not many people seem to talk about it much anymore! Aside from the fact that no one knows and anyone who has heard, knows very little, it's always a good idea to put in some ideas of what could be the next theme, as the Staff always love to read what you're hoping to see in the coming future!
This might belong in the 'Game Discussion' board rather than in the Input section, but I could be wrong. If you plan to edit your post and come up with ideas, then I do believe it might belong moreso in the 'Game Opinions & Ideas' board since the Preset Contest is more to show off your presets in-game. Don't count on my opinion though, I could be wrong!