I'm willing to go without jailbreak for a few months...my 4S has been very laggy lately anyway. I like to get a feel for the new processor when I buy a new phone. Nothing I can't live without
i don't tweak too much nowadays but there are a few things that i do with my jb iphone that make it so much more pleasant to use. Blurriedncbackground is the most beautiful and simple tweak though. It feels like you're pulling a frosted pane of glass over your screen. I hate the notification center's background. I'm going to miss it until the jb team hacks the iphone 5.
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I will deffo miss jailbreak, bitesms with quick reply, infinifolders, winterboard, sbsettings etc..
Problem is each processor is getting harder to crack! Im guessing December/2013 before we see a jb