Since you asked, which is quite cool that you are actually willing to ask us what WE want to see instead of what you just want to produce:
Dark Matter...this has been practically begged for ever since 3rd edition came out and alternity got cancelled for a true d20 conversion. I know we could use shadow chasers, but its just not the same thing than a true to form d20 Dark Matter.
A good Steampunk d20 setting. That has not been done for d20 as of right now, and I know a lot more people would like that than a world war 2 minigame.
As for your ww2 minigame, I do agree with the other person who said that it will be a good replacement for Pinnacle's wierd wars setting.
A true to form space opera game that is not Star Wars. Magic is optional. Your Mecha game was really cool by the way.
A street fighter/mortal kombat type of game with rules for killing finishing moves and awesome combo's.
A remake of Planescape, now that would be cool also.
Adventures for other established mini-games that you have already written, but not for thunderball ralley. If you wrote a side trek adventure for a previous mini-game every once in a while, perhaps every other issue, then we would see some support for
them, even small support, and I think that would be good.
Or just write up some adventures for other established books, some of which are listed below, once a year instead of a mini-game. We don't need a mini-game each issuee, and if you had one issue where we get one adventure for Call of Cthulu, one for Star Wars, one for Dragonstar, one for Wheel of Time, even if they are simple side treks, then all of us who like these games would feel really appreciated that you took the time to think about the fans for all these worlds also.