Hm, you guys talk about how Lizard or maybe some other villian should be in SM3, not GG2. But i doubt that would be even possible. SM3 MUST include GG2, whether it is lame or not, it has to have GG2 somewhere.
Logically, SM3 SHOULD/MUST be set chroniclogically, a few days, weeks, or just months after SM2. Think about it, with Harry knowing the truth about Peter/SM, is it going to likely at all that they will remain friends for a year or two? I think Harry in SM3 will likely to be either declared as "missing"/going insane somehow, and not appearing to be the same Harry he was at the beginning of SM2. It's without a doubt that Peter and Harry arent going to be the same buddies as they were before, Harry may probably not even show up in public for anything, only shown to us as a crazy guy going through a phase of indecisions. I doubt SM3 can set place at any time other than right after SM2, just wouldnt work with Harry's discovery of the "cave" for the GG gear and Parker's idenity.
Just some food for thoughts, its very late here, sorry if what i typed doesnt make that much sense. I'll repost it later with better construction.