As HOW spell casting is based on IQ not Levels, there are spells for every IQ level included from IQ8 to IQ18.
Yet as every Referee and Player knows, more spells are always wanted! To that end I am compiling a rather extensive new, and separate, spell book.
Two questions for you:
1) Should it's creation supersede a #0 issue of Cauldron?
2) Should it include all the spells from the HOW rules book as well as all the new spells?
Let me know, and I hope you get your printed copies of the rules soon, I know I am anxious to get mine!
Image from John Howe portfolio