This is all conjecture and rumor until there are tangible announcements , and there may be a lot being left out of these reports. As of right now though,this sounds like in many ways the deformed interbred love child of "One Year Later" and The New 52 wearing the old discarded rotting flesh of the Marvel now relaunches as a skin suit.
I always try to give new directions and stuff benefit of the doubt, but I literally have no enthusiasm for another reboot,which this is by another method.
I mean,on the surface it's an intriguing idea,but it just feels like Rebirth was literally last week and now here we go tossing it out again for the next thing by the same people in charge of those other things that nearly drove me away from DC comics completely and comics in general just a couple years ago,and frankly I've not fully regained my enthusiasm for the medium and the DC universe, so much so,I'm only right now regularly reading the Superman books,only really because Superman is my favorite character and in a weird way I feel like I'm obligated to.
That obligation ends if they indeed replace Superman with Jon Kent. I like the character. Like both the Rebirth and Bendis era incarnations and think he has potential,but he's not Superman. There is only one Superman and that's Clark Kent/Kal-El. That's not hyperbole. That's not just an opinion. That's a fact. Superman is not a cape and symbol that can be passed around.
Look, maybe I'm wrong there will be good stories that come out of this, and Clark (and his contemporaries Bruce,Diana etc) will still be around and prominent characters in this 5G thing,and maybe Jon will make for an interesting new take on Superman. A situation that would work for me is if Clark remains Superman but on a more cosmic level with his own ongoing while Jon is Superman of Earth with his own book. That set up might be fun for awhile,but as Sacred said above me, as this sounds like now it feels like it's a natural leaving point rather than making me excited for new possibilities. Maybe because I'm getting older and more cynical. Maybe I've just been "shown the door" by the DiDio regime enough times now that I'm finally taking the hint that DC Comics and their characters aren't for me anymore, or maybe I've grown beyond Superheroes in printed form. Maybe it's all of it. I don't really know. All I know is right now,this may end up being how my exit from a world I've been following since I was a kid.