By Charlotte Tutton EastEnders will air four departures next week on the BBC soap, with new opportunities and worrying news ahead. Four different characters are set to leave Walford, including one resident who will at some point make a permanent exit from the show. While it’s thought all four characters who leave next week will be back soon, there’s a chance that only three of the four characters will be back on screen. That’s because one of the names was confirmed to be leaving the soap after over 15 years a few months ago, while they remain on screen for the time being. So might the exit nex…