today Sony has released PS Vita System Software update v1.66 with details being added below.
Download: PS Vita Firmware / System Software Update v1.66 (US) / PS Vita Firmware / System Software Update v1.66 (JP)
For those curious, Sony has removed PS Vita update v1.65 from PlayStation Network due to a technical fault related to adhoc play in PSP titles.
While there is no official changelog posted yet PlayStation Vita Firmware 1.66 is expected to remedy this issue for users.
As always, more details will be posted when they are available!