Cool, thanks! Yes I may do similar then, better to be overprepared!
Ignore the SS5, I mis-read another experience at Newark. After citizenship you have to update Social security that you're a citizen, but you have to wait 10 days to do it (the social security office is in same building as interview).
I have read of some people being notified prior that it will be a combo but the majority seems to be in our situation where we'll just have to see on the day :).