Same here. My iPhone 4 runs great in ios5 and my iPad 2 has the exact same internals as the 4s, so I don't see any reason to upgrade at this point. The camera sounds nice, but honestly, the phone in the iphone4 still takes outstanding pictures.
I just hope that the JB community finds a way to enable Siri on older hardware
I also think the updated antenna's are worth a look. I know they're more of just correct poor previous design but still, from what it sounds like it should actually be a good phone.