I would pot them up to be safe since you are undecided although Iris can take abuse but the spring is the most important season. Sure if you had borers last year and ounce of prevention is best then relocating it to your new home.

Here is a link that might be useful: Propagating Perennials

Agree with Bullthistle - if you knew for sure that you could replant within a week or two, I would say: "Go ahead and move them bare" but since you don't know when you will be able to put them in the ground, potting is probably best. I just received 9 iris roots from France that were out of the ground a long, long time. Since we still have snow on the ground here, I potted them up ten days ago and put under my grow lights - whoa! these things are growing like crazy - green leaves about 5 inches long!