Tethered or untethered doesn't matter. It's just a matter of iOS. Google "Cydia app list 2012" and choose the first link. (can't post external links). That list consists of some of the more popular tweaks, and in the chart, there will be 3 columns, for the iPad, iPhone and iPod Touch. And it'll show the '6' symbol where applicable, meaning it's compatible with iOS 6. And there should be an iOS check or warning for most Cydia apps/tweaks in Cydia