I would not hold my breath waiting on SIG. They would not be the first company to quietly fix an issue without public ally acknowledging the underlying issue.
Glock and Beretta have done this for years. Glock's Glock 22 gen 3 reliability issues with WMLs, Beretta early PX4 issues, the 1301 shell release issue Beretta quietly fixed etc. Another example would be Remington knowing about safety issues with the Model 700 trigger for years before being forced to publically acknowle the issue.