Mike and Deidre had a baby and named it Dana.
For some reason, "Angela" and Paul stole the baby from the rehab canter she worked at. "Angela" changes her name to Mary Alice.
Diedre figures out who stole her baby and goes to get the baby-Paul kills her and stuffs her into a toy chest.
Mary Alice cannot live with the guilt of baby stealing, maybe she found out something on Paul, so she kills herself. Paul panics and digs up the body under the pool. (surprising how fast that pool was redone and ready for Zachs pool party a few episodes back)
Mrs Hubers sister is starting to put things together and will want an investigation done into Mrs Hubers death.
Gabrielle will be preggers with Carlos baby, but it will get out that she thinks the baby might be Johns. Carlos will end up with the money from the hospital wrong doing case. And the baby. OR Johns parents will think it is their grandchild and a custody suit will get filed. Better yet, Gaby will deliver twins and John and Carlos will each get one baby.
Maybe.....
Rex will have another major heart attack, the police will figure out the pharmacist-George was changing the meds, and he will be arrested just in time to be a cellmate to Carlos. He will confess to Carlos that he has trouble with women, the two of them will fall in love and go fight Gaby for the baby, becoming another new "family" on Wisteria Lane.
Susan will get her living room fixed up from the fire, borrowing the builders from Edie's site and Edie and Susan will have a huge fight.
The PI that Susan hired will mention to Paul that Susan was warned by Mike to stay clear of him and Paul will panic again and try to kill Susan. Paul will mistakenly kill Susan's Mother instead, maybe choking her with those ugly hippie beads she was busy hanging last night.
Real estate prices will plumment as Wisteria Lane will have become bad luck with all the fires and murders going on, and then ................
It will be revealed who Mike really is. I dunno.