I have an use case where I need each card created in a board to have a predefined checklist, is that possible?
It might be possible in a future version using an API or plug-in.
In general, if there's something that needs to be done for every card on a board, that idea maps more closely to the card being in a given list than having a pre-defined checklist. I understand that this doesn't allow for, say, two out of three tasks having been done. But we want to keep Trello as simple as possible, so this isn't built-in for the time being.