I don't think they will leave Oliver & Felicity alone entirely either. There is a loud vocal fan base that might revolt. LOL! I personally hope they don't and wouldn't be upset if it is romantic. I just think that personal could be as much about being the Arrow as about a romantic angle. It also gives the EPs a chance to bring another comic book superhero to life. Said superhero might even get more emphasis than Felicity based on the past introduction of such characters. One thing I can say for Felicity, she sure can pick 'em -Arrow, The Flash, New Superhero (Blue Beetle is speculation I am seeing).
According to SA -who at least seems to have an idea of what is going on-Season 3 is about humanity lost (flashbacks) and humanity found (how much does Oliver want back).