It seems we will get to see SHINee's Key and CNBLUE's Jungshin hosting Mnet's 'M! Countdown' soon!
A rep from Mnet revealed on February 16th,"Key and Lee Jungshin are positively discussing about their positions as the MCs for 'M! Countdown'".
According to various official broadcasters, 'M! Countdown' will going through a reorganization in mid-March and they are in the midst of choosing the new hosts for the show. If the appearances of both Key and Jungshin are confirmed, they will start their new jobs in mid-March.