Wirelessly posted (iPhone: Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420.1 (KHTML, like Gecko) Version/3.0 Mobile/4A102 Safari/419.3)
It almost definitely won't work when it is first released but I'm sure that someone will figure it out and within a month or so (maybe less) will release a process to jailbreak 2.0. This is the way it happened with the last few firmware updates anyway.