Apparently, Melanie's 'life changing decision' will be her taking the Drinks Diva van on the music festival circuit (for 5 weeks), hoping to make enough money to afford a rental property so she can move out of Karl & Susan's place when she returns - so it seems she will back.
And Chelsea will do a runner (see the latest DS article on the Chelsea Murphy thread), so she will be the 'surprise departure'. But will she return at some stage...?