It’s just one of those “formulas”, or manner of speech that is not translated word for word between languages. It really means the same as “la question est, quels sont…” or “la question est: quels sont…”.
The English “One wants to know, what is …” could be use as a translation that keeps savoir/know.
In fact many modern French speakers will find the original sentence a bit archaic and long winded
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