Okay so we know each class will get 2 upgraded cards from the core set. We also know one of them will be the core set talent card (thats 9 possibilities)
Assuming that it won't be a card that already has an upgraded version that is a pretty limited set of cards. That's a bit of an assumption because they can just make a level 3 version of .45 auto.
Core set cards without an upgraded version:
Guardian: Dodge, Dynamite Blast, Evidence and Machete
Mystic: Drawn to the Flame, Forbidden Knowledge, Holy Rosary
Rogue: Backstab, Burglary, Elusive
Seeker: Barricade, Doc Chris, Medical Texts, Mind Over Matter, Old Book of Lore, Research Librarian, Working a Hunch.
Survivor: This has been spoiled, its Rabbit's Foot.
My thoughts: almost all of the events could be changed to a L2 "and draw a card effect" but I find those boring so I hope we don't see them.
What would you like to see?