A small bit of cast news today from WicNet stating that Will Tudor, who played Olyvar in season 3, will be returning for season 4 according to the actors CV. Olyvar worked as one of Petyr Baelish’s informant’s, discovering the the Tyrell’s plans to wed Loras and Sansa.
His role in season 3 lasted all but 5 minutes, so could should we expect the same thing from his part in season 4? maybe. Since he is a show created character I really have no idea what his importance (if any) will be in the upcoming season. This is one of those bits of news we will have to just site back and see where it goes.