This is what I'm thinking. Although I would love it if Caitlin goes, "You did what? That's not dark. I'll tell you dark. So, you know Killer Frost? ..." Because it is annoying me to have people say Felicity is dark (or "ruthless" like Laurel did in 708).
Also, I'm happy about this because I feel like the Arrow and Flash writers have completely ignored the fact that they could have developed a Felicity/Caitlin friendship going back to S3/S1 with the first crossover on either show (they even knew each other in Arrow S2!), even outside of the crossover.
Just look at how badly Felicity needs friends right now. Why is her best bet at the moment a character from another show she hasn't really interacted with in years (on-screen)? (I'm not counting them being in the same room the past few crossovers.) UGH.
Yep. Although I do think that they're going to semi-resolve things enough in the crossover (Arrow or Supergirl episode) that they can then realistically have a time jump between the crossover/710 without it seeming like they've frozen Oliver and Felicity in place so as to not have any major conversations off-screen (even though they may as well if it happens in the Supergirl hour since not every Arrow fan will necessary watch the entire crossover).
My guess is things won't be as tense between Oliver and Felicity in 710, but they'll still be working things out for a couple episodes, maybe a conversation or two an episode considering everything else that will probably be going on.