A new calibre? What complication appropriate to this watch is not already in house from VC? Standalone split-seconds? Regulator? Retrograde chronograph?!? What could it be... May as well dream big, no? Someone already hoped for the dual-register split-seconds complication from the 57260.
that actually raises another interesting questions. I wonder if there is a collection of complications already done and ready for production that had to wait for release of the 57260 before they could be marketed and sold - due to exclusivity. That opens a wealth of possibility for both mid- and high-complications.