Soprano strings almost always come in re-entrant tuning. If there is no indication of whether the set is high or low G, it's fairly safe to assume they are high-G.
They will often indicate a tuning either C-tuning (gCEA) or D-tuning (aDF#B). However, which ever size is indicated, the strings will be suitable for the other tuning - there's not a great deal of difference in tension between the two.
Soprano String Comparison
The Baron tests out D'Addario J6502, then Aquila Soprano Regular, then Seaguar 100% flourcarbon fishing line
One thing that's caught me and others out in the past: some companies (such as D'Addario) write the string names in the opposite order i.e. BF#DA or AECG. This isn't some strange new tuning - just the standard C and D tunings written the other way round.