The city council has been trying to rename Interstate to Cesar Chavez Blvd for a while. From what I understand, they didn’t necessarily go through the right channels to rename a street, so have gotten some pretty fierce pushback from the community. Recently, they decided that they needed to rename something to Cesar Chavez Blvd, so they switched their efforts to SW 4th.
There are lots of bystanders (including myself) who are saying WTF to the whole thing, but one in particular decided to take renaming into his own hands. There is now an initiative to rename E 42nd to Douglas Adams Blvd. I love Portland.