TBH that's a fair worry. With this contest after the game types where posted as to what we are going with it was public posted i think within 24-36 hours.
Other contests normally all the same cause lets be honest.. its hard to Keep IM-D quiet about something he is excited about =)
Actually all the contests before were set up by me, with debate in chat beforehand, so really the place to be if you want a head start is the tf2maps.net chat room!
Although this one was not run by me and having the ctf thing required a bit more private talk in our special hidden-from-your-eyes-forum.
On a slightly related tangent.. you can see the current mods here - http://forums.tf2maps.net/showgroups.php They are the only people who knew details of the contest before hand, as stated before Boojum, shmitz and Myself are not entering, which leaves ID DP and DJ (I love how short I can make your names guys
And if DrPepper makes a full map he should win, hands down.