S12 preview by me (this is pure speculation from me taking in account what was said and this promo video):
If Hannah show up , will be killed by Dex or Debra
Dexter will die at end of Season 8.
Debra will get custody of Harrison.
S7 XMas picture with Dex, Deb and Harrison will show up in last episode.
This is NOT end i wanted....guess i will buy DVD only up to S7.