A curious move by Sony because they have basically ditched our beloved PSvita, heres whats new:
Some mainstream sites are mentioning that this could be an attempt at fixing piracy issues. A weird statement given that piracy requires a hacked Vita, which means firmware 3.60. Firmwares 3.61, 3.63, 3.65, and now 3.67 are not impacted with piracy, so piracy is not (directly) the reason.
It is possible however that this update patches things related to the recent psvpsftools release, or simply fixes other undisclosed issues. We’ll have to wait for some hints from scene hackers to know more. Stay tuned!