spells_us.txt in the beta download you will find the spells have been basically templated, but assigned to nobody and are currently incomplete. So while you can see what is intended to likely be added it's basically not really useful information at this time. Starts around entry 61659 and goes until entry 64276 with some reserved spells at the end.
Essentially just "New" whatever previous spell was called.
Also, I'm not nessesarily keeping track every expansion. I do keep a get repo https://github.com/jessebevil/spells_us to help me track it.
Sadly the file is such a large text file it's nessesary to use an external tool to see the changes from one file to the next. I'm currently using gitkraken. But you're welcome to follow along with me.
Should be noted that I usually only track this stuff during / just after beta to keep an eye on the new stuff to update plugins and such.