That's not what I have been reading. They are saying their options are pretty limited. I'm sure they will do something on a small scale, but the chances of a large scale attack are pretty small. This is a pretty good summary of where things stand.
https://www.washingtonpost.com/worl...-stand-after-soleimanis-death/?outputType=amp
https://www.cnn.com/2020/01/07/politics/rockets-us-airbase-iraq/index.html
Not sure what we call this in terms of small vs. large but they're certainly retaliating.