Apologies if this is redundant, but I haven't been around in a smidge: who do we think this is? He? is someone who seems to be-
1. At the least, emotionally engaged with MJ, and at the most, aware of Spidey's secret identity
2. Either has supernatural abilities that allow control over villains with formidable willpower like Wilson Fisk, OR illusionary powers that even Mysterio could not discern from reality
3. No compunctions about killing (poor Mendel Stromm)
4. Is likely to be someone big, "Guess my name" as much a teaser to fans as it was Stromm.
Whoever it is, it's nice to have a mystery similar to the true identity of the original Hobgoblin or the "resurrection" of Gwen Stacy waaaay back in Amazing Spider-Man # 144. I hope this pans out well.