Which one(s) do you prefer?

Y: I'm sorry I didn't show up today.

X: Can't say that I'm surprised after what happened last week.

Y: No, no, it's got nothing to do with that. I just forgot about it.

X: Really? So you're coming next week? / So you're still coming next week? / So you're going to come next week? / So you're still going to come next week?

Are all the sentences above natural for the context? Which one(s) do you prefer?