Currency- guaranteed
Depending on what you mean. No=continue to use pound Yes=continue to use pound (fully tradeable currency very one can use). Or if you mean value of currency, then not guaranteed in either case, subject to international money markets.
Passports- guaranteed
Depends if the UK leaves the EU surely? Plenty of people seem to want this and didn't the Tories promise an referendum?
An economy not based on one of the most volatile elements- guaranteed
Scotland had many other strings to its bow. Yes the oil will be a nice buffer, but when it runs out we have other things. RUK economy relies heavily on City of London banking type stuff - pretty volatile?
Influence in large international bodies- guaranteed
EU only if UK doesn't leave. Other bodies, Meh. Do we really want to belong to a club that requires nukes to join?
Also guaranteed- avoiding the huge costs of negotiating international treaties, setting up the bureaucracy needed, etc.
Scotland already has much of the admin in place, we do already do quite a lot on our own... International treaties are constantly renegotiated anyway, but this none I agree with. Splitting up will be a hugely complex and costly process, not as costly as remaining in the Union though. Short term pain for long term gain and all that...