From the official press release:

CHAMPAIGN, Ill. - The University of Illinois football team will not renew the contracts of four members of its current coaching staff. Offensive coordinator/tight ends coach Mike Schultz, quarterbacks coach Kurt Beathard, receivers coach Jim Pry and special teams coordinator Mike Woodford will not be retained, Illinois head coach Ron Zook said today.

Zook also announced he will begin a national search to replace the departed coaches and to fill both his offensive and defensive coordinator positions. Curt Mallory and Dan Disch, current members of the Illini football staff who shared the roles of defensive coordinator the past three seasons, will continue as position coaches.

"These are some major coaching staff changes," said Zook. "Obviously we are not happy with the way the past two seasons have gone, but we believe in this program and its ability to rebound with the necessary decisions.

I can't thank these coaches and their families enough for how hard they worked, for the heart and soul they poured into Illinois football," Zook continued. "These are good, good people. These are the most difficult days in our business. I really wish all of them the very best in any future endeavors. I truly mean that."

(HT/TFJ: Illinois Loyalty)

So we have almost no one returning on the offensive side of the ball, and the defensive coordinators will be demoted but not removed. There will be new faces at the most important coaching positions below Zook. The most important question, will Zook cede control of the defense to the new DC, or will it continue  completely unaltered, because Zook has been in control of the D, regardless of who the assistants were.