http://yuletide.livejournal.com/996420.html?thread=11992644#t11992644 is the stuff about treats - looks like the full prompt list won't be available until Madness, but there's no reason you can't skim through the spreadsheet of Dear Author letters and find fandoms and prompts that you want to write for that way!

Which reminds me, I must write my Dear Author letter tonight.