I don’t remember them making such a promise… I just remember them saying, if we come back for another season, this is what you’ll see: [insert Tad Cooper scene].
ETA:
And now we're almost done,
Our tale completely spun,
As buffed and polished as a royal jewel
There's not much left to tell,
And hey, that's just as well,
Unless we get one more surprise renewal
Now
We'll prob'ly have to go and get work
On some cheap-ass cable network,
But-
The door is not quite shut!
So if we make the cut,
Here's what you'll see on Galavant...
That doesn’t sound particularly optimistic (but then again, neither did the Season One finale).