The just released iTunes 11 is definitely a significant upgrade over iTunes 10.7. But how much of you have updated already? Probably jailbreakers should got their considers about the jailbreak things. And I am glad to told you that, there's no need for fear, it have been confirmed to be safe for jailbreak by iJailbreak.
"If iTunes 11 says it’s Jailbreak safe, then it must be!
The biggest question we were asked when Apple released iTunes 11 yesterday was is iTunes 11 Jailbreak safe? After doing some research into the matter this morning I can conclude that iTunes 11 is Jailbreak safe. Now how did I reach this conclusion? Well, for starters I took out all my Jailbroken devices and synced them using iTunes 11. I was able to transfer music, videos and everything else you can think of without any trouble. Then to be safe I restored one of my devices back to its stock firmware and re-Jailbroke it to see if iTunes 11 would interrupt the process; it did not.
iTunes 11 is indeed Jailbreak safe and in case you were on the fence about updating, you will be glad to know you can do so now. iTunes 11 can be downloaded through a software update on your computer, or directly from Apple’s website. Drop us a line if you experience any troubles with iTunes 11 and your Jailbroken device in the comments section below."