I would almost garauntee a Nuc would be Full Depth frames, but you can always modify yourself 1 nuc/box to suit.
I did the same for a mate - he will be running all 1 size frame - I think they are Ideal depth. He bought a nuc box, then I cut the bottom section off to make it an ideal depth nuc, but can add that bit of wood back to make it a full depth nuc if required.
I'm not quite sure on the process we will use to take his nuc from a full depth nuc to ideal depth nuc. My idea was to:
Get some of my full depth frames and get a nuc going.
Add an ideal depth brood box under the full depth frames, let them draw it out and let the queen lay eggs there to get brood into the ideal frames.
Shake all the bees (or just the queen if I can find her) into the bottom ideal box, add a queen excluder, then the full depth frames on top.
Let the brood hatch and then they'll back fill it with honey.
I wouldn't worry too much about what happens when you might buy a nuc, as it will be the exception to the rule.
I would focus on what your normal practices will be, then modify what you need to suit.