I'm new here, but from what I've gathered is the "people in the know" are JWFearman, Legacy, Wesker69, and Dr. Jimmy. There are a few more but these are the main ones trying to help.
And now since JWFearman has endorsed the SZ list Tony posted, we can go about speculating on where they will be and get into the deeper themes.
Like you said you would like to see Ecto 1 driving around chasing ghosts, but the more realistic possibility is that HHN will have their own ghost hunters, Legendary Truth, involved in the Ghost SZ.
And I can't wait for the Skoolhouse Trick-or-Treaters waving body parts at their victims.