If it is important to you to have a Jailbroken device, then you know that the device available today can be jailbroken! The device might or might not be jail breakable tomorrow. Look at the iPad2 there where demos of a jailbroken iPad2 released almost at once, but the actual jailbreak took months to happen.
I hear that it is possible we will see IOS6 before the next iPhone, we know that Apple chooses to play a cat and mouse game. No one has their hands on an IOS 6 version today, the versions that exist are all betas, and the only thing we know is they will change before the final release...