3G unrestrictor isn't needed anymore & couldn't be used anyway if you upgraded to iOS 6. I'm sure there will be some sort of jailbreak app or tweak when the jailbreak is available whenever that could be.
I prefer Tango over Facetime since it's cross platform and I can video chat with friends who have Android phones with front facing cameras. No need for Wi-Fi. It also allows the user to leave video messages if they don't answer.
Still won't work on unlimited, though. It will work on tiered data plans, and there is no reason for it not to. I can't see any reason, other than greed, to not let people use their 2 or 4 gigabytes of data they are paying for however they want.
I updated as soon as it was available. I figured the odds of them realasing a 6.0-only jailbreak weeks (likely) after 6.0.1 came out were slim to none, despite musclenerd recommending staying on 6.0. Now if they were close, I might have stayed put, but 6.0 was pretty buggy so I would have needed more concrete evidence that it was necessary. We'll see, but I'd be very surprised to see a jailbreak for the iPhone 5 that doesn't work on the latest firmware. The last one actually required the latest firmware.