"Really excited, it should be a good time," McMillen said via text message Monday.
The Cyclones offered the 6-foot-2, 220-pound McMillen in early February, joining Central Michigan.
No matter how good an impression Iowa State makes over the weekend, McMillen doesn't expect to commit just yet, maintaining he'll likely wait until summertime.
"Most likely," he said. "My dad is not gonna be there so I'm gonna wait and see what he thinks about [ISU] when we visit sometime in April."
McMillen's father, Bob, is head coach of the Los Angeles Kiss of the Arena Football League.
The linebacker is also hearing from Illinois and Iowa.