While PS Vita Firmware 1.66 offered an adhoc play PSP title bugfix over PS Vita Firmware 1.65, there is currently no official PlayStation Vita System Software v1.67 changelog available.
As always, once new details surface from Sony we will update this article with the changes included in this revision.
Update: Sony's Japanese PlayStation site now states that PS Vita Firmware v1.67 fixes a game-related issue with Dream Club Zero Portable which prevented the camera functionality from working properly.
PlayStation Vita 1.67 System Software Changelog: The main function will be updated in system software version 1.67
When you use the camera while playing PlayStation Vita of some standard software, the screen will stop symptoms has been confirmed. This symptom has been improved system software at this time.
Dream Club ZERO Portable
Stay tuned for more PS3 Hacks and PS3 CFW news, follow us on Twitter and be sure to drop by the PS3 Hacks and PS3 Custom Firmware Forums for the latest PlayStation 3 scene updates and homebrew releases!
No it doesn't - it was already on PSN store BEFORE the fw update and has nothing to do with it. On top of it - that's a crap game which is Free to PAY and not to play as you're being charged to actually play more than a few rounds per day (unless you want to mess around with your system date). I've deleted that garbage 5 minutes after downloading it and went back to free alternatives elsewhere.