Actual Guess: I honestly have no idea. I'd like it to be Ben or Miguel, but I'm fairly certain that isn't going to happen (the only way I could see it being Ben is the Jackal has played a role in recent stories, so there is potential...Also, Slott has messed with some time travel stuff in recent stories as well, which could explain Miguel...but then again, I'm just not convinced that's the route Slott is going to go). I think Norman showing up with the last issue was a red herring, but we'll see and it seemed like Slott discounted Harry in that issue as being an option, but I could be wrong. My best guess is probably Tiberus Stone - he'll get powers similar to Miguel (his name being a wink to that), Doc will be the one who creates him, he makes him a Superior spider-man and maybe the gold octo-bot shuts down peter's powers or something. Who knows...Is it time for 700 to be out yet?!
Shot in the Dark: One guess is that it will be peter, and something will happen with his mind (I'll be Ock switches minds with him, but somehow it gets messed up, so it makes Peter smarter, a little less goofy, more serious, and more brutal). But instead of a complete "oh, it's doc's mind in peters body" it will get messed up so it is a combination of the both of them and may result in some amnesia on the part of peter (or whatever his name will be...Potter Parktavius?). The thing about this though, there is no accounting for the changes in powers (i.e., claws n' stuff).