*: ep

Basically, we are trying to take down Prometheus and Team Arrow has one way of going about it and Felicity thinks she has a better way with Helix and we disagree, so it is basically, we are going after the same objective but there is a tactical difference on how we are doing it and Oliver and Felicity have a great scene where he says ‘Please, don’t do it this way’ and she is saying ‘This is why I have to’. It’s a really good scene…Emily and I hadn’t had kind of a long solo scene in a little bit. So it’s good, it set the four-five last episodes of the year pretty good pretty well.
— 

Stephen Amell talks about an Olicity upcoming scene at HVFF Chicago

I don’t know if Oliver and Felicity are going to get back together…I do know…hang on!…  I do know there has been coldness but a very deliberately almost robotic feeling and temperature to the relationship this year and we explain what that is in an upcoming episode.
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Stephen Amell at HVFF Chicago [March 2017]

I bet we’ll see an explanation on a 4.5 flashback