Felicity looks incredibly happy at the conversation she's having with the man she loves. This is surprising given the close proximity of Oliver and his new wife. Perhaps they have spoken about what his marriage really means to him and how much he loves the woman he left behind.
This is a surprisingly gentle moment between Oliver and Nyssa. With a simple touch of their hands, it seems they have reached some sort of communication wherein they may be working together toward a common goal, at the very least.
It surely cannot be a coincidence that this pair of forlorn lovers is framed by the electric blue of fluorescent lighting as they must be about as blue as they can be given their strange and unfortunate circumstances.
Oliver and Felicity are together again, but this time he's married to another an on his way to becoming the leader of the League of Assassins. We can assume things are not the same as the last time they met.