Yes, it’s almost hilarious, but this is exactly what happened: Sony have released a software update for the PS Vita (1.65) but just a short time afterwards, removed it and replaced it with the 1.66 update for the handheld.

Basically, the same things are announced on the change list of the 1.66 update as on the previous one:

- You can now disable the notification alert messages that indicate when friends sign in, messages are received and other activities. To disable these alerts, got to [Settings] > [Sound & Display] > check/uncheck [Notification Alerts]. Additionally, Notification alerts will now display for five seconds instead of three seconds
- ‘After 10 Minutes’ has been added as an option in [Power Save Settings] > [Auto Standby]
- An arrow will indicate when new activities are available in LiveArea
- Caps Lock is now supported by the on-screen keyboard. Simply double-tap the Shift key to enable it

Apparently, Sony decided to remove the Ad-Hoc support for reasons unknown at the moment and other reports claim that this software update enables PlayStation Minis support for PlayStation Plus users on the Vita, which is indeed exciting.