Is it really a hardware tweak ? I think i saw somewhere that it was firmware specific, maybe someone can make magic happend dunno cant remember well.
I believe it's a slight hardware tweak with the radios -- not positive. Either way, the April 12th iPhone will come with 6.1.3 and that is not jailbreak-able.
In other words, I cannot get that device because I can't stand iOS without jailbreak.
What's worse, looking ahead, even if I decide to keep the iPhone, if iOS 7 brings some changes I want, but not all -- for example, I don't foresee them going all gesture base, which is how I have my iPhone set up with jailbreak (go Zephyr!) -- I have to make a difficult and complicated decision to either update and lose jailbreak, or keep jailbreak and not get the supposedly big revamp that is iOS 7. If it works out that iOS 7 brings nothing or everything I want to the table, then I'm fine. But if it gets split, then I'm boned.
Like others have mentioned, this is a real sore spot for jailbreak users when it comes time for OS updates. It can take months for jailbreakers to figure out how to crack the latest version of iOS. Months! That utterly eliminates the whole "updates on day one" benefit that iOS users so adore. Yes, it's my choice, but there you have it; caveat after caveat as an iPhone user.
Not to mention, jailbreak is unstable. I have very few jailbreak apps and have eliminated the ones that may be culprits (like Auxo, which is a damn shame cause Auxo was great) yet still my iPhone crashes every few days. It either reboots entirely, or goes into "Safe Mode" which requires rebooting to work properly again anyway. So even if iOS 7 and jailbreak all works out, the instability of jailbreak is just unsustainable.
Having said all that...
You guys can all rest easy. It's looking more and more likely that I am going with the S4 or possibly the One as soon as that decision is possible to make in the US, and will then cease my incessant complaining (or as I'd like to call it, telling the hard truth ) about iOS.