Jordan – who quit the soap in February to create Holby City spin-off HolbyBlue through his own production company Red Planet Pictures – has already penned an episode of the Albert Square drama since his return.
Speaking to The Stage, the BBC's Controller of Continuing Drama Series John Yorke said: "He has come back to write another episode. I can't say too much but it is really exciting."
He added: "We had an idea and we went to him and he said, 'Wow, I have to do that'. He has come back because he could not resist. It is in his blood. He loves it."