WTF, looks like i missed out being able to JB a new phone this week, no iPhone for me then. Was gonna purchase an iPhone 7 Plus outright with part of my Christmas bonus. But with this news of no downgrading a new iPhone now, looks like I missed the boat.
This whole Jailbreak stuff with iPhone's is alien to me, so strange the way it goes.
I'm a Nexus guy, always root and ROM Android phones. They never have weird stuff like this, neededing to downgrade and only having a short 2 week period to do so, otherwise you miss out, WTF that's strange. And then never knowing if or when a JB may possibly maybe might come out some time.
Guess I'm sticking with my Nexus 6P, and will have to pick up a Pixel XL now. But I was super pumped for a JB 7 Plus, oh well
10.2 has been out for just over a week. I highly doubt you'll find new iPhones already updated. You should be ok if you buy one in the next week or two. Jailbreaking is much more of a pain than rooting. Not the actual process just the cat and mouse game that Apple and the jailbreak community play.