So far, I have never seen pre-gapped iridium plugs. The only pre-gapped plugs I am aware of are the Bosch Fine Wire platinum. It clearly says in footnotes not to gap, as it will break the tips off. The iridium plugs have no such footnote and show different gaps for different applications.
Interesting, Its been several years since I bought them, I look now and even the part numbers I used to buy pre-gapped no longer give a gap. I see Denso now has a procedure for gaping them and also state no warranty if broken.