Call of Kwi-Sin is not a new spell. All these while, Call of the Wild has always been similar to rogue's Set Trap - meaning there is the base spell (where you get to choose what to summon) and the "stand alone" version - meaning each spell is a different animal. Think of it like this:
Rogue:
Base spell -> Set traps
"SA" version -> Flash traps, sleep traps, death trap
Poet:
Base spell -> Call of the Wild (or Call of [alignment] if you are aligned])
"SA" version -> Companion of [alignment] (NONE if you are not aligned)
In this case, the base spell for Kwi sin poets is called Call of Kwi-Sin, as you previously mentioned on your post. Keep in mind that if you want the "SA" version of the spell, you HAVE to join an alignment, else it will not appear in your "Learn secret" list.
Hope this helps