Steve Jones is about to sign as the new co-host of “Entertainment Tonight,” replacing Mark Steines. The host of “The X Factor” has been in talks to take over the reins of “ET” with Nancy O’Dell after Simon Cowell announced Jones would not return to “X Factor.” He’s been filling in on “ET” since March, and sources say they are offering a deal to make him a full-time co-host. We revealed that Steines was calling it quits after 17 years. “ET” reps said, “Nothing has been confirmed.”