Thank you for your question to Ask the Expert.
If you are transplanting potted iris plants, you could definitely plant in the early spring.
Iris bulbs are typically divided and replanted in the mid-summer (after blooming).
If you plan to plant bulbs at this time, you will likely get a small bloom this season and it will be better in 2014 since the roots will have time to grow and create energy reserves for the blooming process. Follow the planting and care instructions found here: http://www.extension.umn.edu/distribution/horticulture/M1267.html
Please let me know if you have any further questions.