This just in: Senior Editor Anne Sowards of Ace/Roc announced the following via Twitter about twenty minutes ago:
"ATTN AUTHORS & AGENTS: am officially looking for steampunk..."
Yep, you read that right. Steampunk!
However, don't put all your eggs in one basked because Executive Editor Angela James of Samhain Publishing is also looking for steampunk (with romantic elements).
Go forth and multiply, steampunk!