Quick update today as I am working on GenSTEPS 4 and getting it ready for the launch this weekend.
I got an e-mail from The Box today regarding the Chain Reaction video, they said:

“Steps ‘chain reaction’ will be added when we get it from the record label. We’ve seen the video and its excellent, hopefully a week on Friday.”

Last time they told me a week Friday for a Steps video it was added the same week. Also no news yet if it is an MTV Exclusive, if it is expect a premiere some time this week.