Are they still going to be in high school? Since I first saw ASM, I thought treating that as senior year and beginning ASM2 with graduation/college would make the most sense. It'd give a pretty natural way to introduce MJ and Harry.
Also, I still hope they kill Gwen in 3. If they kill her in 2 and rush an MJ romance in 3, it'll feel really weird. Let the Gwen arc cover the whole trilogy, and develop MJ as a troubled/party girl here so we get her growth when Gwen dies.
I could be wrong but I remember Webb wanting to to still be in high school. We shall see if thats where the studio lets him go.