Season 2 Prophecies

Christine:

John will die
Bobby will come back as surrogate father
Sam and Dean will not be as close because of John’s death,and Bobby will be the mediator
Impala will be fixed at the end of season (Jen thinks it’ll turn into Batmobile)
(After S02E03: Bloodlust) Vampire Hunter Gordon will come back
(After S02E10: Hunted) Gordon will come back eventually
(After S02E10: Hunted) A demon made a call with Ava's fiancee's blood
(After S02E10: Hunted) Ash told Gordon about Sam’s premonitions, though it may have been on accident
After S02E15: Tall Tales) The Trickster will come back.

Jen:

Sarah Blake will come back
Sam and Dean will get a really shitty rental car while they're fixing the Impala
John will go away on John business
Focus of show will change and will learn more about special children
Sam and Dean will go back to S1 where they’re not friends because of disconnect over Dad dying
Better weapons
(After S02E03: Bloodlust) Dean told Vampire Hunter Gordon the truth about Sam while they were drinking
(After S02E08: Crossroad Blues) Crossroads demon will come back
(After S02E10: Hunted) Jo will come back a badass

Streaming