Curtis has the same smile on a different day. Over the course of these photos, we see Curtis in three different outfits, so several days must pass. It's been a while since we've seen this kind of business action!
Perhaps Nyssa is making her entrance. She's back during "Unchained" to make her move. I'm assuming this is her move against Malcolm Merlyn, but I'm not sure why she'd have to come to Star City to do it, since he should be ruling of the League of Assassins out her way.
Green Arrow is being hella rude by poking Arsenal in the chest. Or maybe he's about to do that thing where he's going to pull a fast one and flip Arsenal in the nose afterward, too! Oooh! Seriously. We have no idea why Roy is back in town. Maybe it has to do with Speedy's absence.
Oliver: Over watch, we're on sight. Felicity: Excuse me? Oliver: Well, I thought it was time you got a code name. What do you think? Felicity: It's perfect. Oliver: I was gonna go with Oracle, but it's taken.