Dear Miss Snark,
Would I be a nitwit to include in a query letter a reference to a novel that I have signed a contact with a small publisher for, (a respected, traditional publisher) but has not yet been published? I understand things can still happen that can delay a publication date, or even halt it. I believe my newest work would have a much larger audience, therefore the search for an agent. But I don't want to sound like a duncewagon in the letter by mentioning the other novel yet, if I should not.
No, this isn't nitwittery. You say you have a novel scheduled for publication with LuckyDucky and Shark in 200X. We all understand what that means.