They are (almost) all available in FK1 - I think only one or two are too high level for a character to cast directly (. There will be new spells in FK2 and FK3, although spell progression will probably be a little bit slower due to attribute caps and somewhat slower level progression at higher levels. At the highest levels (over 20th) there's going to be an even heavier dependency on spell upgrades.
I've got a spreadsheet with about twice the number of spells on it than are in the current game. But some of the ideas have changed already based on tester feedback.